979995521 has 16 divisors (see below), whose sum is σ = 1024133760. Its totient is φ = 936606720.

The previous prime is 979995469. The next prime is 979995539. The reversal of 979995521 is 125599979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-979995521 is a prime.

It is a super-2 number, since 2×979995521² = 1920782442360122882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (979995221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1740386 + ... + 1740948.

It is an arithmetic number, because the mean of its divisors is an integer number (64008360).

Almost surely, 2^979995521 is an apocalyptic number.

It is an amenable number.

979995521 is a deficient number, since it is larger than the sum of its proper divisors (44138239).

979995521 is a wasteful number, since it uses less digits than its factorization.

979995521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096.

The product of its digits is 2296350, while the sum is 56.

The square root of 979995521 is about 31304.8801467119. The cubic root of 979995521 is about 993.2868751325.

The spelling of 979995521 in words is "nine hundred seventy-nine million, nine hundred ninety-five thousand, five hundred twenty-one".