872079961 has 3 divisors (see below), whose sum is σ = 872109493. Its totient is φ = 872050430.

The previous prime is 872079959. The next prime is 872080009. The reversal of 872079961 is 169970278.

It is a happy number.

The square root of 872079961 is 29531.

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

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 is not a de Polignac number, because 872079961 - 2¹ = 872079959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872079911) 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, 14766 + ... + 44296.

Almost surely, 2^872079961 is an apocalyptic number.

872079961 is the 29531-st square number.

872079961 is the 14766-th centered octagonal number.

It is an amenable number.

872079961 is a deficient number, since it is larger than the sum of its proper divisors (29532).

872079961 is an frugal number, since it uses more digits than its factorization.

872079961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59062 (or 29531 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 49.

The cubic root of 872079961 is about 955.4004373173.

Multiplying 872079961 by its sum of digits (49), we get a square (42731918089 = 206717²).

The spelling of 872079961 in words is "eight hundred seventy-two million, seventy-nine thousand, nine hundred sixty-one".