115211515 has 4 divisors (see below), whose sum is σ = 138253824. Its totient is φ = 92169208.

The previous prime is 115211489. The next prime is 115211521. The reversal of 115211515 is 515112511.

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

It is a cyclic number.

It is not a de Polignac number, because 115211515 - 2¹³ = 115203323 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 11521147 + ... + 11521156.

It is an arithmetic number, because the mean of its divisors is an integer number (34563456).

Almost surely, 2^115211515 is an apocalyptic number.

115211515 is a deficient number, since it is larger than the sum of its proper divisors (23042309).

115211515 is an equidigital number, since it uses as much as digits as its factorization.

115211515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23042308.

The product of its digits is 250, while the sum is 22.

The square root of 115211515 is about 10733.6627019857. The cubic root of 115211515 is about 486.5923712715.

The spelling of 115211515 in words is "one hundred fifteen million, two hundred eleven thousand, five hundred fifteen".