1312305643251 has 16 divisors (see below), whose sum is σ = 2058518656800. Its totient is φ = 823407462144.

The previous prime is 1312305643237. The next prime is 1312305643261. The reversal of 1312305643251 is 1523465032131.

1312305643251 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 3 + 0 + 5 + 643 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 1312305643251 - 2¹⁰ = 1312305642227 is a prime.

It is a super-2 number, since 2×1312305643251² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312305643261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1429526386 + ... + 1429527303.

It is an arithmetic number, because the mean of its divisors is an integer number (128657416050).

Almost surely, 2^{1312305643251} is an apocalyptic number.

1312305643251 is a deficient number, since it is larger than the sum of its proper divisors (746213013549).

1312305643251 is a wasteful number, since it uses less digits than its factorization.

1312305643251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859053715 (or 2859053709 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 1312305643251 in words is "one trillion, three hundred twelve billion, three hundred five million, six hundred forty-three thousand, two hundred fifty-one".