79900031 has 2 divisors, whose sum is σ = 79900032. Its totient is φ = 79900030.

The previous prime is 79900019. The next prime is 79900043. The reversal of 79900031 is 13000997.

It is a balanced prime because it is at equal distance from previous prime (79900019) and next prime (79900043).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79900031 is a prime.

It is a super-2 number, since 2×79900031² = 12768029907601922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79899967 and 79900003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79900001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39950015 + 39950016.

It is an arithmetic number, because the mean of its divisors is an integer number (39950016).

Almost surely, 2^79900031 is an apocalyptic number.

79900031 is the 3998-th centered decagonal number.

79900031 is a deficient number, since it is larger than the sum of its proper divisors (1).

79900031 is an equidigital number, since it uses as much as digits as its factorization.

79900031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 79900031 is about 8938.6817260712. The cubic root of 79900031 is about 430.7073826261.

The spelling of 79900031 in words is "seventy-nine million, nine hundred thousand, thirty-one".