115979609 has 2 divisors, whose sum is σ = 115979610. Its totient is φ = 115979608.

The previous prime is 115979579. The next prime is 115979621. The reversal of 115979609 is 906979511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113891584 + 2088025 = 10672^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 115979609 - 2²⁴ = 99202393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (115979009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57989804 + 57989805.

It is an arithmetic number, because the mean of its divisors is an integer number (57989805).

Almost surely, 2^115979609 is an apocalyptic number.

It is an amenable number.

115979609 is a deficient number, since it is larger than the sum of its proper divisors (1).

115979609 is an equidigital number, since it uses as much as digits as its factorization.

115979609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 115979609 is about 10769.3829442545. The cubic root of 115979609 is about 487.6713177414.

The spelling of 115979609 in words is "one hundred fifteen million, nine hundred seventy-nine thousand, six hundred nine".