102531431 has 4 divisors (see below), whose sum is σ = 102855192. Its totient is φ = 102207672.

The previous prime is 102531427. The next prime is 102531449. The reversal of 102531431 is 134135201.

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 102531431 - 2² = 102531427 is a prime.

It is a super-2 number, since 2×102531431² = 21025388685815522, 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 (102531461) 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, 161405 + ... + 162038.

It is an arithmetic number, because the mean of its divisors is an integer number (25713798).

Almost surely, 2^102531431 is an apocalyptic number.

102531431 is a deficient number, since it is larger than the sum of its proper divisors (323761).

102531431 is an equidigital number, since it uses as much as digits as its factorization.

102531431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323760.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 102531431 is about 10125.7805131259. The cubic root of 102531431 is about 468.0429122144.

Adding to 102531431 its reverse (134135201), we get a palindrome (236666632).

The spelling of 102531431 in words is "one hundred two million, five hundred thirty-one thousand, four hundred thirty-one".