79521021631 has 2 divisors, whose sum is σ = 79521021632. Its totient is φ = 79521021630.

The previous prime is 79521021607. The next prime is 79521021653. The reversal of 79521021631 is 13612012597.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79521021631 - 2³⁵ = 45161283263 is a prime.

It is a super-2 number, since 2×79521021631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79521021691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39760510815 + 39760510816.

It is an arithmetic number, because the mean of its divisors is an integer number (39760510816).

Almost surely, 2^79521021631 is an apocalyptic number.

79521021631 is a deficient number, since it is larger than the sum of its proper divisors (1).

79521021631 is an equidigital number, since it uses as much as digits as its factorization.

79521021631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 79521021631 in words is "seventy-nine billion, five hundred twenty-one million, twenty-one thousand, six hundred thirty-one".