115622991 has 16 divisors (see below), whose sum is σ = 186865920. Its totient is φ = 70074360.

The previous prime is 115622987. The next prime is 115623007. The reversal of 115622991 is 199226511.

115622991 is a `hidden beast` number, since 1 + 1 + 562 + 2 + 9 + 91 = 666.

It is not a de Polignac number, because 115622991 - 2² = 115622987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115622921) 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 in 15 ways as a sum of consecutive naturals, for example, 194355 + ... + 194948.

It is an arithmetic number, because the mean of its divisors is an integer number (11679120).

Almost surely, 2^115622991 is an apocalyptic number.

115622991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

115622991 is a deficient number, since it is larger than the sum of its proper divisors (71242929).

115622991 is a wasteful number, since it uses less digits than its factorization.

115622991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389323 (or 389317 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 115622991 is about 10752.8131667950. The cubic root of 115622991 is about 487.1709685072.

The spelling of 115622991 in words is "one hundred fifteen million, six hundred twenty-two thousand, nine hundred ninety-one".