31036961 has 4 divisors (see below), whose sum is σ = 31071300. Its totient is φ = 31002624.

The previous prime is 31036949. The next prime is 31036979. The reversal of 31036961 is 16963013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2307361 + 28729600 = 1519^2 + 5360^2 .

It is a cyclic number.

It is not a de Polignac number, because 31036961 - 2⁶ = 31036897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31036991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15776 + ... + 17633.

It is an arithmetic number, because the mean of its divisors is an integer number (7767825).

Almost surely, 2^31036961 is an apocalyptic number.

It is an amenable number.

31036961 is a deficient number, since it is larger than the sum of its proper divisors (34339).

31036961 is an equidigital number, since it uses as much as digits as its factorization.

31036961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34338.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 31036961 is about 5571.0825698422. The cubic root of 31036961 is about 314.2628635787.

Adding to 31036961 its reverse (16963013), we get a palindrome (47999974).

The spelling of 31036961 in words is "thirty-one million, thirty-six thousand, nine hundred sixty-one".