79131831 has 4 divisors (see below), whose sum is σ = 105509112. Its totient is φ = 52754552.

The previous prime is 79131797. The next prime is 79131841. The reversal of 79131831 is 13813197.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79131831 - 2¹⁵ = 79099063 is a prime.

It is a super-2 number, since 2×79131831² = 12523693354825122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79131792 and 79131801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79131841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13188636 + ... + 13188641.

It is an arithmetic number, because the mean of its divisors is an integer number (26377278).

Almost surely, 2^79131831 is an apocalyptic number.

79131831 is a deficient number, since it is larger than the sum of its proper divisors (26377281).

79131831 is a wasteful number, since it uses less digits than its factorization.

79131831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26377280.

The product of its digits is 4536, while the sum is 33.

The square root of 79131831 is about 8895.6073991606. The cubic root of 79131831 is about 429.3225876076.

The spelling of 79131831 in words is "seventy-nine million, one hundred thirty-one thousand, eight hundred thirty-one".