1313318921 has 2 divisors, whose sum is σ = 1313318922. Its totient is φ = 1313318920.

The previous prime is 1313318899. The next prime is 1313318927. The reversal of 1313318921 is 1298133131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152942025 + 160376896 = 33955^2 + 12664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313318921 - 2³⁰ = 239577097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313318927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656659460 + 656659461.

It is an arithmetic number, because the mean of its divisors is an integer number (656659461).

Almost surely, 2^1313318921 is an apocalyptic number.

It is an amenable number.

1313318921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313318921 is an equidigital number, since it uses as much as digits as its factorization.

1313318921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 1313318921 is about 36239.7422866113. The cubic root of 1313318921 is about 1095.1074506568.

The spelling of 1313318921 in words is "one billion, three hundred thirteen million, three hundred eighteen thousand, nine hundred twenty-one".