1312561455 has 16 divisors (see below), whose sum is σ = 2148938880. Its totient is φ = 683752608.

The previous prime is 1312561441. The next prime is 1312561469. The reversal of 1312561455 is 5541652131.

It is an interprime number because it is at equal distance from previous prime (1312561441) and next prime (1312561469).

It is not a de Polignac number, because 1312561455 - 2⁹ = 1312560943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016845 + ... + 1018134.

It is an arithmetic number, because the mean of its divisors is an integer number (134308680).

Almost surely, 2^1312561455 is an apocalyptic number.

1312561455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1312561455 is a deficient number, since it is larger than the sum of its proper divisors (836377425).

1312561455 is a wasteful number, since it uses less digits than its factorization.

1312561455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035030.

The product of its digits is 18000, while the sum is 33.

The square root of 1312561455 is about 36229.2900151245. The cubic root of 1312561455 is about 1094.8968731719.

The spelling of 1312561455 in words is "one billion, three hundred twelve million, five hundred sixty-one thousand, four hundred fifty-five".