1315857913 has 2 divisors, whose sum is σ = 1315857914. Its totient is φ = 1315857912.

The previous prime is 1315857911. The next prime is 1315857931. The reversal of 1315857913 is 3197585131.

Together with next prime (1315857931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1087152784 + 228705129 = 32972^2 + 15123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315857913 - 2¹ = 1315857911 is a prime.

Together with 1315857911, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1315857913.

It is not a weakly prime, because it can be changed into another prime (1315857911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657928956 + 657928957.

It is an arithmetic number, because the mean of its divisors is an integer number (657928957).

Almost surely, 2^1315857913 is an apocalyptic number.

It is an amenable number.

1315857913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315857913 is an equidigital number, since it uses as much as digits as its factorization.

1315857913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 43.

The square root of 1315857913 is about 36274.7558640992. The cubic root of 1315857913 is about 1095.8127069203.

The spelling of 1315857913 in words is "one billion, three hundred fifteen million, eight hundred fifty-seven thousand, nine hundred thirteen".