1312531263251 has 16 divisors (see below), whose sum is σ = 1426079054400. Its totient is φ = 1207971483264.

The previous prime is 1312531263247. The next prime is 1312531263259. The reversal of 1312531263251 is 1523621352131.

It is a happy number.

It is not a de Polignac number, because 1312531263251 - 2² = 1312531263247 is a prime.

It is a super-2 number, since 2×1312531263251² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312531263259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145991 + ... + 1626768.

It is an arithmetic number, because the mean of its divisors is an integer number (89129940900).

Almost surely, 2^{1312531263251} is an apocalyptic number.

1312531263251 is a deficient number, since it is larger than the sum of its proper divisors (113547791149).

1312531263251 is an equidigital number, since it uses as much as digits as its factorization.

1312531263251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773135 (or 1773109 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The spelling of 1312531263251 in words is "one trillion, three hundred twelve billion, five hundred thirty-one million, two hundred sixty-three thousand, two hundred fifty-one".