115220031 has 4 divisors (see below), whose sum is σ = 153626712. Its totient is φ = 76813352.

The previous prime is 115220029. The next prime is 115220057. The reversal of 115220031 is 130022511.

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 115220031 - 2¹ = 115220029 is a prime.

It is a super-2 number, since 2×115220031² = 26551311087281922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115220011) 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, 19203336 + ... + 19203341.

It is an arithmetic number, because the mean of its divisors is an integer number (38406678).

Almost surely, 2^115220031 is an apocalyptic number.

115220031 is a deficient number, since it is larger than the sum of its proper divisors (38406681).

115220031 is an equidigital number, since it uses as much as digits as its factorization.

115220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38406680.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 115220031 is about 10734.0593905568. The cubic root of 115220031 is about 486.6043599994.

Adding to 115220031 its reverse (130022511), we get a palindrome (245242542).

The spelling of 115220031 in words is "one hundred fifteen million, two hundred twenty thousand, thirty-one".