115570991 has 2 divisors, whose sum is σ = 115570992. Its totient is φ = 115570990.

The previous prime is 115570969. The next prime is 115570993. The reversal of 115570991 is 199075511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 115570991 - 2²² = 111376687 is a prime.

Together with 115570993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115570993) 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, 57785495 + 57785496.

It is an arithmetic number, because the mean of its divisors is an integer number (57785496).

Almost surely, 2^115570991 is an apocalyptic number.

115570991 is a deficient number, since it is larger than the sum of its proper divisors (1).

115570991 is an equidigital number, since it uses as much as digits as its factorization.

115570991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 38.

The square root of 115570991 is about 10750.3949229784. The cubic root of 115570991 is about 487.0979245309.

The spelling of 115570991 in words is "one hundred fifteen million, five hundred seventy thousand, nine hundred ninety-one".