115615391 has 2 divisors, whose sum is σ = 115615392. Its totient is φ = 115615390.

The previous prime is 115615327. The next prime is 115615439. The reversal of 115615391 is 193516511.

It is a strong prime.

It is an emirp because it is prime and its reverse (193516511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115615391 - 2⁶ = 115615327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115615301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57807695 + 57807696.

It is an arithmetic number, because the mean of its divisors is an integer number (57807696).

Almost surely, 2^115615391 is an apocalyptic number.

115615391 is a deficient number, since it is larger than the sum of its proper divisors (1).

115615391 is an equidigital number, since it uses as much as digits as its factorization.

115615391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 32.

The square root of 115615391 is about 10752.4597650956. The cubic root of 115615391 is about 487.1602942158.

The spelling of 115615391 in words is "one hundred fifteen million, six hundred fifteen thousand, three hundred ninety-one".