131399939 has 4 divisors (see below), whose sum is σ = 143345400. Its totient is φ = 119454480.

The previous prime is 131399929. The next prime is 131399941. The reversal of 131399939 is 939993131.

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 131399939 - 2⁸ = 131399683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131399893 and 131399902.

It is not an unprimeable number, because it can be changed into a prime (131399929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5972714 + ... + 5972735.

It is an arithmetic number, because the mean of its divisors is an integer number (35836350).

Almost surely, 2^131399939 is an apocalyptic number.

131399939 is a deficient number, since it is larger than the sum of its proper divisors (11945461).

131399939 is a wasteful number, since it uses less digits than its factorization.

131399939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11945460.

The product of its digits is 177147, while the sum is 47.

The square root of 131399939 is about 11462.9812439871. The cubic root of 131399939 is about 508.3916253377.

The spelling of 131399939 in words is "one hundred thirty-one million, three hundred ninety-nine thousand, nine hundred thirty-nine".