115215977 has 2 divisors, whose sum is σ = 115215978. Its totient is φ = 115215976.

The previous prime is 115215931. The next prime is 115215979. The reversal of 115215977 is 779512511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88755241 + 26460736 = 9421^2 + 5144^2 .

It is a cyclic number.

It is not a de Polignac number, because 115215977 - 2⁶ = 115215913 is a prime.

Together with 115215979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115215977.

It is not a weakly prime, because it can be changed into another prime (115215979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57607988 + 57607989.

It is an arithmetic number, because the mean of its divisors is an integer number (57607989).

Almost surely, 2^115215977 is an apocalyptic number.

It is an amenable number.

115215977 is a deficient number, since it is larger than the sum of its proper divisors (1).

115215977 is an equidigital number, since it uses as much as digits as its factorization.

115215977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 38.

The square root of 115215977 is about 10733.8705507380. The cubic root of 115215977 is about 486.5986528980.

The spelling of 115215977 in words is "one hundred fifteen million, two hundred fifteen thousand, nine hundred seventy-seven".