102131431 has 4 divisors (see below), whose sum is σ = 106571952. Its totient is φ = 97690912.

The previous prime is 102131429. The next prime is 102131443. The reversal of 102131431 is 134131201.

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 102131431 - 2¹ = 102131429 is a prime.

It is a super-2 number, since 2×102131431² = 20861658396215522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102131411) 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, 2220226 + ... + 2220271.

It is an arithmetic number, because the mean of its divisors is an integer number (26642988).

Almost surely, 2^102131431 is an apocalyptic number.

102131431 is a deficient number, since it is larger than the sum of its proper divisors (4440521).

102131431 is an equidigital number, since it uses as much as digits as its factorization.

102131431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4440520.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 102131431 is about 10106.0096477294. The cubic root of 102131431 is about 467.4334693279.

Adding to 102131431 its reverse (134131201), we get a palindrome (236262632).

The spelling of 102131431 in words is "one hundred two million, one hundred thirty-one thousand, four hundred thirty-one".