115312257 has 6 divisors (see below), whose sum is σ = 166562162. Its totient is φ = 76874832.

The previous prime is 115312229. The next prime is 115312277. The reversal of 115312257 is 752213511.

It can be written as a sum of positive squares in only one way, i.e., 73205136 + 42107121 = 8556^2 + 6489^2 .

It is not a de Polignac number, because 115312257 - 2⁷ = 115312129 is a prime.

It is a super-2 number, since 2×115312257² = 26593833228868098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115312257.

It is not an unprimeable number, because it can be changed into a prime (115312217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6406228 + ... + 6406245.

Almost surely, 2^115312257 is an apocalyptic number.

It is an amenable number.

115312257 is a deficient number, since it is larger than the sum of its proper divisors (51249905).

115312257 is a wasteful number, since it uses less digits than its factorization.

115312257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12812479 (or 12812476 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 115312257 is about 10738.3544828805. The cubic root of 115312257 is about 486.7341568898.

Adding to 115312257 its reverse (752213511), we get a palindrome (867525768).

The spelling of 115312257 in words is "one hundred fifteen million, three hundred twelve thousand, two hundred fifty-seven".