115977209 has 2 divisors, whose sum is σ = 115977210. Its totient is φ = 115977208.

The previous prime is 115977157. The next prime is 115977223. The reversal of 115977209 is 902779511.

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., 67980025 + 47997184 = 8245^2 + 6928^2 .

It is a cyclic number.

It is not a de Polignac number, because 115977209 - 2¹² = 115973113 is a prime.

It is not a weakly prime, because it can be changed into another prime (115977229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57988604 + 57988605.

It is an arithmetic number, because the mean of its divisors is an integer number (57988605).

Almost surely, 2^115977209 is an apocalyptic number.

It is an amenable number.

115977209 is a deficient number, since it is larger than the sum of its proper divisors (1).

115977209 is an equidigital number, since it uses as much as digits as its factorization.

115977209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 115977209 is about 10769.2715166812. The cubic root of 115977209 is about 487.6679538764.

The spelling of 115977209 in words is "one hundred fifteen million, nine hundred seventy-seven thousand, two hundred nine".