1915113857 has 2 divisors, whose sum is σ = 1915113858. Its totient is φ = 1915113856.

The previous prime is 1915113839. The next prime is 1915113881. The reversal of 1915113857 is 7583115191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1287661456 + 627452401 = 35884^2 + 25049^2 .

It is an emirp because it is prime and its reverse (7583115191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1915113857 - 2⁶ = 1915113793 is a prime.

It is a super-2 number, since 2×1915113857² = 7335322170546832898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1915113817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957556928 + 957556929.

It is an arithmetic number, because the mean of its divisors is an integer number (957556929).

Almost surely, 2^1915113857 is an apocalyptic number.

It is an amenable number.

1915113857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915113857 is an equidigital number, since it uses as much as digits as its factorization.

1915113857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 41.

The square root of 1915113857 is about 43762.0138590536. The cubic root of 1915113857 is about 1241.8377746287.

The spelling of 1915113857 in words is "one billion, nine hundred fifteen million, one hundred thirteen thousand, eight hundred fifty-seven".