115590991 has 2 divisors, whose sum is σ = 115590992. Its totient is φ = 115590990.

The previous prime is 115590967. The next prime is 115591051. The reversal of 115590991 is 199095511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115590991 - 2¹⁷ = 115459919 is a prime.

It is a super-3 number, since 3×115590991³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115590691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57795495 + 57795496.

It is an arithmetic number, because the mean of its divisors is an integer number (57795496).

Almost surely, 2^115590991 is an apocalyptic number.

115590991 is a deficient number, since it is larger than the sum of its proper divisors (1).

115590991 is an equidigital number, since it uses as much as digits as its factorization.

115590991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18225, while the sum is 40.

The square root of 115590991 is about 10751.3250811237. The cubic root of 115590991 is about 487.1260209604.

The spelling of 115590991 in words is "one hundred fifteen million, five hundred ninety thousand, nine hundred ninety-one".