79011025921 has 27 divisors (see below), whose sum is σ = 83140953987. Its totient is φ = 75084493680.

The previous prime is 79011025889. The next prime is 79011025999. The reversal of 79011025921 is 12952011097.

The square root of 79011025921 is 281089.

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

It can be written as a sum of positive squares in only one way, i.e., 70700151025 + 8310874896 = 265895^2 + 91164^2 .

It is not a de Polignac number, because 79011025921 - 2⁵ = 79011025889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79011025321) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 738420750 + ... + 738420856.

Almost surely, 2^79011025921 is an apocalyptic number.

79011025921 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

79011025921 is the 281089-th square number.

79011025921 is the 140545-th centered octagonal number.

It is an amenable number.

79011025921 is a deficient number, since it is larger than the sum of its proper divisors (4129928066).

79011025921 is an frugal number, since it uses more digits than its factorization.

79011025921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 37.

The spelling of 79011025921 in words is "seventy-nine billion, eleven million, twenty-five thousand, nine hundred twenty-one".