102131031 has 4 divisors (see below), whose sum is σ = 136174712. Its totient is φ = 68087352.

The previous prime is 102130999. The next prime is 102131033. The reversal of 102131031 is 130131201.

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

It is not a de Polignac number, because 102131031 - 2⁵ = 102130999 is a prime.

It is a super-2 number, since 2×102131031² = 20861494986245922, 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 = 102130998 and 102131016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102131033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17021836 + ... + 17021841.

It is an arithmetic number, because the mean of its divisors is an integer number (34043678).

Almost surely, 2^102131031 is an apocalyptic number.

102131031 is a deficient number, since it is larger than the sum of its proper divisors (34043681).

102131031 is an equidigital number, since it uses as much as digits as its factorization.

102131031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34043680.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 102131031 is about 10105.9898575053. The cubic root of 102131031 is about 467.4328590892.

Adding to 102131031 its reverse (130131201), we get a palindrome (232262232).

The spelling of 102131031 in words is "one hundred two million, one hundred thirty-one thousand, thirty-one".