115775581 has 2 divisors, whose sum is σ = 115775582. Its totient is φ = 115775580.

The previous prime is 115775551. The next prime is 115775587. The reversal of 115775581 is 185577511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115025625 + 749956 = 10725^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 115775581 - 2¹⁷ = 115644509 is a prime.

It is a super-2 number, since 2×115775581² = 26807970311775122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115775587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57887790 + 57887791.

It is an arithmetic number, because the mean of its divisors is an integer number (57887791).

Almost surely, 2^115775581 is an apocalyptic number.

It is an amenable number.

115775581 is a deficient number, since it is larger than the sum of its proper divisors (1).

115775581 is an equidigital number, since it uses as much as digits as its factorization.

115775581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49000, while the sum is 40.

The square root of 115775581 is about 10759.9061798884. The cubic root of 115775581 is about 487.3851840937.

The spelling of 115775581 in words is "one hundred fifteen million, seven hundred seventy-five thousand, five hundred eighty-one".