115311215 has 4 divisors (see below), whose sum is σ = 138373464. Its totient is φ = 92248968.

The previous prime is 115311211. The next prime is 115311239. The reversal of 115311215 is 512113511.

It is a happy number.

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 115311215 - 2² = 115311211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115311211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11531117 + ... + 11531126.

It is an arithmetic number, because the mean of its divisors is an integer number (34593366).

Almost surely, 2^115311215 is an apocalyptic number.

115311215 is a deficient number, since it is larger than the sum of its proper divisors (23062249).

115311215 is an equidigital number, since it uses as much as digits as its factorization.

115311215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23062248.

The product of its digits is 150, while the sum is 20.

The square root of 115311215 is about 10738.3059650952. The cubic root of 115311215 is about 486.7326907880.

Adding to 115311215 its reverse (512113511), we get a palindrome (627424726).

The spelling of 115311215 in words is "one hundred fifteen million, three hundred eleven thousand, two hundred fifteen".