931287289 has 3 divisors (see below), whose sum is σ = 931317807. Its totient is φ = 931256772.

The previous prime is 931287257. The next prime is 931287347. The reversal of 931287289 is 982782139.

The square root of 931287289 is 30517.

It is a perfect power (a square), and thus also a powerful number.

931287289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 929762064 = 1235^2 + 30492^2 .

It is not a de Polignac number, because 931287289 - 2⁵ = 931287257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (931287209) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15259 + ... + 45775.

It is an arithmetic number, because the mean of its divisors is an integer number (310439269).

Almost surely, 2^931287289 is an apocalyptic number.

931287289 is the 30517-th square number.

931287289 is the 15259-th centered octagonal number.

It is an amenable number.

931287289 is a deficient number, since it is larger than the sum of its proper divisors (30518).

931287289 is an frugal number, since it uses more digits than its factorization.

931287289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61034 (or 30517 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The cubic root of 931287289 is about 976.5501666277.

Multiplying 931287289 by its sum of digits (49), we get a square (45633077161 = 213619²).

The spelling of 931287289 in words is "nine hundred thirty-one million, two hundred eighty-seven thousand, two hundred eighty-nine".