979531281 has 12 divisors (see below), whose sum is σ = 1415154052. Its totient is φ = 652893696.

The previous prime is 979531261. The next prime is 979531297. The reversal of 979531281 is 182135979.

979531281 is a `hidden beast` number, since 97 + 9 + 531 + 28 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 601034256 + 378497025 = 24516^2 + 19455^2 .

It is not a de Polignac number, because 979531281 - 2⁵ = 979531249 is a prime.

It is a super-2 number, since 2×979531281² = 1918963060915001922, 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 (979531261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72405 + ... + 84861.

Almost surely, 2^979531281 is an apocalyptic number.

It is an amenable number.

979531281 is a deficient number, since it is larger than the sum of its proper divisors (435622771).

979531281 is a wasteful number, since it uses less digits than its factorization.

979531281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21200 (or 21197 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 979531281 is about 31297.4644500158. The cubic root of 979531281 is about 993.1300049149.

The spelling of 979531281 in words is "nine hundred seventy-nine million, five hundred thirty-one thousand, two hundred eighty-one".