12731511556 has 9 divisors (see below), whose sum is σ = 22280540149. Its totient is φ = 6365642944.

The previous prime is 12731511553. The next prime is 12731511601. The reversal of 12731511556 is 65511513721.

The square root of 12731511556 is 112834.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7721136900 + 5010374656 = 87870^2 + 70784^2 .

It is a super-2 number, since 2×12731511556² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12731511553) 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 2 ways as a sum of consecutive naturals, for example, 197460 + ... + 253876.

Almost surely, 2^12731511556 is an apocalyptic number.

12731511556 is the 112834-th square number.

It is an amenable number.

12731511556 is a deficient number, since it is larger than the sum of its proper divisors (9549028593).

12731511556 is an frugal number, since it uses more digits than its factorization.

12731511556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112838 (or 56419 counting only the distinct ones).

The product of its digits is 31500, while the sum is 37.

The spelling of 12731511556 in words is "twelve billion, seven hundred thirty-one million, five hundred eleven thousand, five hundred fifty-six".