15315913 has 2 divisors, whose sum is σ = 15315914. Its totient is φ = 15315912.

The previous prime is 15315889. The next prime is 15315931. The reversal of 15315913 is 31951351.

Together with next prime (15315931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14417209 + 898704 = 3797^2 + 948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15315913 is a prime.

It is not a weakly prime, because it can be changed into another prime (15315983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7657956 + 7657957.

It is an arithmetic number, because the mean of its divisors is an integer number (7657957).

Almost surely, 2^15315913 is an apocalyptic number.

It is an amenable number.

15315913 is a deficient number, since it is larger than the sum of its proper divisors (1).

15315913 is an equidigital number, since it uses as much as digits as its factorization.

15315913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2025, while the sum is 28.

The square root of 15315913 is about 3913.5550334702. Note that the first 3 decimals coincide. The cubic root of 15315913 is about 248.3405452114.

The spelling of 15315913 in words is "fifteen million, three hundred fifteen thousand, nine hundred thirteen".