131231239 has 8 divisors (see below), whose sum is σ = 132321920. Its totient is φ = 130145400.

The previous prime is 131231237. The next prime is 131231257. The reversal of 131231239 is 932132131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131231239 - 2¹ = 131231237 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 (131231237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68902 + ... + 70780.

It is an arithmetic number, because the mean of its divisors is an integer number (16540240).

Almost surely, 2^131231239 is an apocalyptic number.

131231239 is a deficient number, since it is larger than the sum of its proper divisors (1090681).

131231239 is a wasteful number, since it uses less digits than its factorization.

131231239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421.

The product of its digits is 972, while the sum is 25.

The square root of 131231239 is about 11455.6204109599. The cubic root of 131231239 is about 508.1739631431.

The spelling of 131231239 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-nine".