1312992847881 has 81 divisors (see below), whose sum is σ = 2258169231591. Its totient is φ = 734266447200.

The previous prime is 1312992847871. The next prime is 1312992847883. The reversal of 1312992847881 is 1887482992131.

The square root of 1312992847881 is 1145859.

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

1312992847881 is a `hidden beast` number, since 13 + 129 + 9 + 28 + 478 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 194229711225 + 1118763136656 = 440715^2 + 1057716^2 .

It is not a de Polignac number, because 1312992847881 - 2⁷ = 1312992847753 is a prime.

It is a super-2 number, since 2×1312992847881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312992847883) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 491572176 + ... + 491574846.

Almost surely, 2^{1312992847881} is an apocalyptic number.

1312992847881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312992847881 is the 1145859-th square number.

1312992847881 is the 572930-th centered octagonal number.

It is an amenable number.

1312992847881 is a deficient number, since it is larger than the sum of its proper divisors (945176383710).

1312992847881 is an equidigital number, since it uses as much as digits as its factorization.

1312992847881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396 (or 2698 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The spelling of 1312992847881 in words is "one trillion, three hundred twelve billion, nine hundred ninety-two million, eight hundred forty-seven thousand, eight hundred eighty-one".