131031139 has 4 divisors (see below), whose sum is σ = 132876720. Its totient is φ = 129185560.

The previous prime is 131031137. The next prime is 131031167. The reversal of 131031139 is 931130131.

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 131031139 - 2¹ = 131031137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131031133) 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, 922684 + ... + 922825.

It is an arithmetic number, because the mean of its divisors is an integer number (33219180).

Almost surely, 2^131031139 is an apocalyptic number.

131031139 is a deficient number, since it is larger than the sum of its proper divisors (1845581).

131031139 is an equidigital number, since it uses as much as digits as its factorization.

131031139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845580.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 131031139 is about 11446.8833749628. The cubic root of 131031139 is about 507.9155456665.

The spelling of 131031139 in words is "one hundred thirty-one million, thirty-one thousand, one hundred thirty-nine".