1311557864 has 8 divisors (see below), whose sum is σ = 2459171010. Its totient is φ = 655778928.

The previous prime is 1311557861. The next prime is 1311557899. The reversal of 1311557864 is 4687551131.

It can be written as a sum of positive squares in only one way, i.e., 1056900100 + 254657764 = 32510^2 + 15958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1311557861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81972359 + ... + 81972374.

Almost surely, 2^1311557864 is an apocalyptic number.

It is an amenable number.

1311557864 is a deficient number, since it is larger than the sum of its proper divisors (1147613146).

1311557864 is a wasteful number, since it uses less digits than its factorization.

1311557864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163944739 (or 163944735 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 1311557864 is about 36215.4368191245. The cubic root of 1311557864 is about 1094.6177474925.

The spelling of 1311557864 in words is "one billion, three hundred eleven million, five hundred fifty-seven thousand, eight hundred sixty-four".