1915916257 has 2 divisors, whose sum is σ = 1915916258. Its totient is φ = 1915916256.

The previous prime is 1915916251. The next prime is 1915916273. The reversal of 1915916257 is 7526195191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1915025121 + 891136 = 43761^2 + 944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1915916257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1915916251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957958128 + 957958129.

It is an arithmetic number, because the mean of its divisors is an integer number (957958129).

Almost surely, 2^1915916257 is an apocalyptic number.

It is an amenable number.

1915916257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915916257 is an equidigital number, since it uses as much as digits as its factorization.

1915916257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 46.

The square root of 1915916257 is about 43771.1806671924. The cubic root of 1915916257 is about 1242.0111866852.

The spelling of 1915916257 in words is "one billion, nine hundred fifteen million, nine hundred sixteen thousand, two hundred fifty-seven".