131231442 has 48 divisors (see below), whose sum is σ = 283646880. Its totient is φ = 40449024.

The previous prime is 131231431. The next prime is 131231521. The reversal of 131231442 is 244132131.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92434 + ... + 93842.

It is an arithmetic number, because the mean of its divisors is an integer number (5909310).

Almost surely, 2^131231442 is an apocalyptic number.

131231442 is an abundant number, since it is smaller than the sum of its proper divisors (152415438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131231442 is a wasteful number, since it uses less digits than its factorization.

131231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1476 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 131231442 is about 11455.6292712360. The cubic root of 131231442 is about 508.1742251723.

Adding to 131231442 its reverse (244132131), we get a palindrome (375363573).

The spelling of 131231442 in words is "one hundred thirty-one million, two hundred thirty-one thousand, four hundred forty-two".