79786521 has 12 divisors (see below), whose sum is σ = 115326640. Its totient is φ = 53154360.

The previous prime is 79786513. The next prime is 79786547. The reversal of 79786521 is 12568797.

It is not a de Polignac number, because 79786521 - 2³ = 79786513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79781521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19470 + ... + 23208.

Almost surely, 2^79786521 is an apocalyptic number.

It is an amenable number.

79786521 is a deficient number, since it is larger than the sum of its proper divisors (35540119).

79786521 is a wasteful number, since it uses less digits than its factorization.

79786521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116 (or 6113 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 79786521 is about 8932.3300991399. The cubic root of 79786521 is about 430.5033244451.

The spelling of 79786521 in words is "seventy-nine million, seven hundred eighty-six thousand, five hundred twenty-one".