979975531 has 2 divisors, whose sum is σ = 979975532. Its totient is φ = 979975530.

The previous prime is 979975519. The next prime is 979975637. The reversal of 979975531 is 135579979.

It is a weak prime.

It is an emirp because it is prime and its reverse (135579979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 979975531 - 2⁹ = 979975019 is a prime.

It is a super-2 number, since 2×979975531² = 1920704082717463922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (979979531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489987765 + 489987766.

It is an arithmetic number, because the mean of its divisors is an integer number (489987766).

Almost surely, 2^979975531 is an apocalyptic number.

979975531 is a deficient number, since it is larger than the sum of its proper divisors (1).

979975531 is an equidigital number, since it uses as much as digits as its factorization.

979975531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2679075, while the sum is 55.

The square root of 979975531 is about 31304.5608657908. The cubic root of 979975531 is about 993.2801213807.

The spelling of 979975531 in words is "nine hundred seventy-nine million, nine hundred seventy-five thousand, five hundred thirty-one".