115937581 has 2 divisors, whose sum is σ = 115937582. Its totient is φ = 115937580.

The previous prime is 115937561. The next prime is 115937587. The reversal of 115937581 is 185739511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68740681 + 47196900 = 8291^2 + 6870^2 .

It is an emirp because it is prime and its reverse (185739511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115937581 - 2⁷ = 115937453 is a prime.

It is a super-2 number, since 2×115937581² = 26883045376263122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115937587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57968790 + 57968791.

It is an arithmetic number, because the mean of its divisors is an integer number (57968791).

Almost surely, 2^115937581 is an apocalyptic number.

It is an amenable number.

115937581 is a deficient number, since it is larger than the sum of its proper divisors (1).

115937581 is an equidigital number, since it uses as much as digits as its factorization.

115937581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 40.

The square root of 115937581 is about 10767.4314950224. The cubic root of 115937581 is about 487.6124041486.

The spelling of 115937581 in words is "one hundred fifteen million, nine hundred thirty-seven thousand, five hundred eighty-one".