79661231 has 16 divisors (see below), whose sum is σ = 89480160. Its totient is φ = 70412160.

The previous prime is 79661221. The next prime is 79661273. The reversal of 79661231 is 13216697.

It is a de Polignac number, because none of the positive numbers 2^k-79661231 is a prime.

It is a super-2 number, since 2×79661231² = 12691823448870722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79661191 and 79661200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79661221) 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, 48581 + ... + 50193.

It is an arithmetic number, because the mean of its divisors is an integer number (5592510).

Almost surely, 2^79661231 is an apocalyptic number.

79661231 is a deficient number, since it is larger than the sum of its proper divisors (9818929).

79661231 is a wasteful number, since it uses less digits than its factorization.

79661231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786.

The product of its digits is 13608, while the sum is 35.

The square root of 79661231 is about 8925.3140560991. The cubic root of 79661231 is about 430.2778643941.

The spelling of 79661231 in words is "seventy-nine million, six hundred sixty-one thousand, two hundred thirty-one".