115215994 has 4 divisors (see below), whose sum is σ = 172823994. Its totient is φ = 57607996.

The previous prime is 115215979. The next prime is 115216009. The reversal of 115215994 is 499512511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499512511 = 2297 ⋅217463.

It is an interprime number because it is at equal distance from previous prime (115215979) and next prime (115216009).

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 29560969 = 9255^2 + 5437^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28803997 + ... + 28804000.

Almost surely, 2^115215994 is an apocalyptic number.

115215994 is a deficient number, since it is larger than the sum of its proper divisors (57608000).

115215994 is an equidigital number, since it uses as much as digits as its factorization.

115215994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57607999.

The product of its digits is 16200, while the sum is 37.

The square root of 115215994 is about 10733.8713426238. The cubic root of 115215994 is about 486.5986768304.

The spelling of 115215994 in words is "one hundred fifteen million, two hundred fifteen thousand, nine hundred ninety-four".