131091939 has 24 divisors (see below), whose sum is σ = 214224192. Its totient is φ = 79448040.

The previous prime is 131091899. The next prime is 131091941. The reversal of 131091939 is 939190131.

It is not a de Polignac number, because 131091939 - 2⁹ = 131091427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131091959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21849 + ... + 27194.

It is an arithmetic number, because the mean of its divisors is an integer number (8926008).

Almost surely, 2^131091939 is an apocalyptic number.

131091939 is a deficient number, since it is larger than the sum of its proper divisors (83132253).

131091939 is an equidigital number, since it uses as much as digits as its factorization.

131091939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49069 (or 49057 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 131091939 is about 11449.5388116727. The cubic root of 131091939 is about 507.9940931278.

The spelling of 131091939 in words is "one hundred thirty-one million, ninety-one thousand, nine hundred thirty-nine".