79612581 has 16 divisors (see below), whose sum is σ = 112575744. Its totient is φ = 49872384.

The previous prime is 79612571. The next prime is 79612583. The reversal of 79612581 is 18521697.

It is not a de Polignac number, because 79612581 - 2⁶ = 79612517 is a prime.

It is a super-2 number, since 2×79612581² = 12676326106963122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79612583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55236 + ... + 56658.

It is an arithmetic number, because the mean of its divisors is an integer number (7035984).

Almost surely, 2^79612581 is an apocalyptic number.

It is an amenable number.

79612581 is a deficient number, since it is larger than the sum of its proper divisors (32963163).

79612581 is a wasteful number, since it uses less digits than its factorization.

79612581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540.

The product of its digits is 30240, while the sum is 39.

The square root of 79612581 is about 8922.5882455709. The cubic root of 79612581 is about 430.1902547308.

The spelling of 79612581 in words is "seventy-nine million, six hundred twelve thousand, five hundred eighty-one".