131943931 has 4 divisors (see below), whose sum is σ = 150793072. Its totient is φ = 113094792.

The previous prime is 131943913. The next prime is 131943979. The reversal of 131943931 is 139349131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139349131 = 3467 ⋅40193.

It is a cyclic number.

It is not a de Polignac number, because 131943931 - 2⁹ = 131943419 is a prime.

It is a super-2 number, since 2×131943931² = 34818401855465522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131943991) 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, 9424560 + ... + 9424573.

It is an arithmetic number, because the mean of its divisors is an integer number (37698268).

Almost surely, 2^131943931 is an apocalyptic number.

131943931 is a deficient number, since it is larger than the sum of its proper divisors (18849141).

131943931 is an equidigital number, since it uses as much as digits as its factorization.

131943931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18849140.

The product of its digits is 8748, while the sum is 34.

The square root of 131943931 is about 11486.6849438818. The cubic root of 131943931 is about 509.0922350006.

The spelling of 131943931 in words is "one hundred thirty-one million, nine hundred forty-three thousand, nine hundred thirty-one".