115857505 has 4 divisors (see below), whose sum is σ = 139029012. Its totient is φ = 92686000.

The previous prime is 115857487. The next prime is 115857551. The reversal of 115857505 is 505758511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14814801 + 101042704 = 3849^2 + 10052^2 .

It is not a de Polignac number, because 115857505 - 2²³ = 107468897 is a prime.

It is a super-2 number, since 2×115857505² = 26845922929650050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11585746 + ... + 11585755.

It is an arithmetic number, because the mean of its divisors is an integer number (34757253).

Almost surely, 2^115857505 is an apocalyptic number.

It is an amenable number.

115857505 is a deficient number, since it is larger than the sum of its proper divisors (23171507).

115857505 is an equidigital number, since it uses as much as digits as its factorization.

115857505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23171506.

The product of its (nonzero) digits is 35000, while the sum is 37.

The square root of 115857505 is about 10763.7124171914. The cubic root of 115857505 is about 487.5001165899.

The spelling of 115857505 in words is "one hundred fifteen million, eight hundred fifty-seven thousand, five hundred five".