115161857 has 4 divisors (see below), whose sum is σ = 115198020. Its totient is φ = 115125696.

The previous prime is 115161847. The next prime is 115161877. The reversal of 115161857 is 758161511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758161511 = 839 ⋅903649.

It can be written as a sum of positive squares in 2 ways, for example, as 42042256 + 73119601 = 6484^2 + 8551^2 .

It is a cyclic number.

It is not a de Polignac number, because 115161857 - 2¹⁰ = 115160833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115161847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12788 + ... + 19845.

It is an arithmetic number, because the mean of its divisors is an integer number (28799505).

Almost surely, 2^115161857 is an apocalyptic number.

It is an amenable number.

115161857 is a deficient number, since it is larger than the sum of its proper divisors (36163).

115161857 is an equidigital number, since it uses as much as digits as its factorization.

115161857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36162.

The product of its digits is 8400, while the sum is 35.

The square root of 115161857 is about 10731.3492627908. The cubic root of 115161857 is about 486.5224515348.

The spelling of 115161857 in words is "one hundred fifteen million, one hundred sixty-one thousand, eight hundred fifty-seven".