131621656 has 16 divisors (see below), whose sum is σ = 247347000. Its totient is φ = 65662464.

The previous prime is 131621653. The next prime is 131621671. The reversal of 131621656 is 656126131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131621653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14730 + ... + 21913.

Almost surely, 2^131621656 is an apocalyptic number.

It is an amenable number.

131621656 is a deficient number, since it is larger than the sum of its proper divisors (115725344).

131621656 is a wasteful number, since it uses less digits than its factorization.

131621656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37098 (or 37094 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 131621656 is about 11472.6481685790. The cubic root of 131621656 is about 508.6774086432.

Adding to 131621656 its reverse (656126131), we get a palindrome (787747787).

The spelling of 131621656 in words is "one hundred thirty-one million, six hundred twenty-one thousand, six hundred fifty-six".