131687256 has 64 divisors (see below), whose sum is σ = 341637120. Its totient is φ = 42255360.

The previous prime is 131687249. The next prime is 131687261. The reversal of 131687256 is 652786131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195336 + ... + 196008.

It is an arithmetic number, because the mean of its divisors is an integer number (5338080).

Almost surely, 2^131687256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131687256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170818560).

131687256 is an abundant number, since it is smaller than the sum of its proper divisors (209949864).

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

131687256 is a wasteful number, since it uses less digits than its factorization.

131687256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 972 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 131687256 is about 11475.5067861947. The cubic root of 131687256 is about 508.7619025804.

The spelling of 131687256 in words is "one hundred thirty-one million, six hundred eighty-seven thousand, two hundred fifty-six".