131000556 has 12 divisors (see below), whose sum is σ = 305667992. Its totient is φ = 43666848.

The previous prime is 131000549. The next prime is 131000557. The reversal of 131000556 is 655000131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×131000556² = 34322291344618272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131000557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5458345 + ... + 5458368.

Almost surely, 2^131000556 is an apocalyptic number.

It is an amenable number.

131000556 is an abundant number, since it is smaller than the sum of its proper divisors (174667436).

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

131000556 is a wasteful number, since it uses less digits than its factorization.

131000556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916720 (or 10916718 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 131000556 is about 11445.5474312066. The cubic root of 131000556 is about 507.8760263330.

Adding to 131000556 its reverse (655000131), we get a palindrome (786000687).

The spelling of 131000556 in words is "one hundred thirty-one million, five hundred fifty-six", and thus it is an aban number.