131639943 has 4 divisors (see below), whose sum is σ = 175519928. Its totient is φ = 87759960.

The previous prime is 131639929. The next prime is 131639953. The reversal of 131639943 is 349936131.

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

It is not a de Polignac number, because 131639943 - 2²⁶ = 64531079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131639953) 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, 21939988 + ... + 21939993.

It is an arithmetic number, because the mean of its divisors is an integer number (43879982).

Almost surely, 2^131639943 is an apocalyptic number.

131639943 is a deficient number, since it is larger than the sum of its proper divisors (43879985).

131639943 is an equidigital number, since it uses as much as digits as its factorization.

131639943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43879984.

The product of its digits is 52488, while the sum is 39.

The square root of 131639943 is about 11473.4451234143. The cubic root of 131639943 is about 508.7009654379.

The spelling of 131639943 in words is "one hundred thirty-one million, six hundred thirty-nine thousand, nine hundred forty-three".