131618971556 has 12 divisors (see below), whose sum is σ = 237763303680. Its totient is φ = 63686599080.

The previous prime is 131618971553. The next prime is 131618971559. The reversal of 131618971556 is 655179816131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131618971553) and next prime (131618971559).

It is a super-2 number, since 2×131618971556² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131618971498 and 131618971507.

It is not an unprimeable number, because it can be changed into a prime (131618971553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530721536 + ... + 530721783.

It is an arithmetic number, because the mean of its divisors is an integer number (19813608640).

Almost surely, 2^131618971556 is an apocalyptic number.

It is an amenable number.

131618971556 is a deficient number, since it is larger than the sum of its proper divisors (106144332124).

131618971556 is a wasteful number, since it uses less digits than its factorization.

131618971556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061443354 (or 1061443352 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 53.

The spelling of 131618971556 in words is "one hundred thirty-one billion, six hundred eighteen million, nine hundred seventy-one thousand, five hundred fifty-six".