131305656 has 64 divisors (see below), whose sum is σ = 349084800. Its totient is φ = 41040000.

The previous prime is 131305631. The next prime is 131305673. The reversal of 131305656 is 656503131.

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, 44631 + ... + 47481.

It is an arithmetic number, because the mean of its divisors is an integer number (5454450).

Almost surely, 2^131305656 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 131305656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174542400).

131305656 is an abundant number, since it is smaller than the sum of its proper divisors (217779144).

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

131305656 is a wasteful number, since it uses less digits than its factorization.

131305656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2976 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 131305656 is about 11458.8680069194. The cubic root of 131305656 is about 508.2700013428.

Adding to 131305656 its reverse (656503131), we get a palindrome (787808787).

The spelling of 131305656 in words is "one hundred thirty-one million, three hundred five thousand, six hundred fifty-six".