115667991 has 12 divisors (see below), whose sum is σ = 175869720. Its totient is φ = 73053360.

The previous prime is 115667977. The next prime is 115668001. The reversal of 115667991 is 199766511.

115667991 is a `hidden beast` number, since 11 + 566 + 79 + 9 + 1 = 666.

It is not a de Polignac number, because 115667991 - 2¹³ = 115659799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115667971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338040 + ... + 338381.

It is an arithmetic number, because the mean of its divisors is an integer number (14655810).

Almost surely, 2^115667991 is an apocalyptic number.

115667991 is a deficient number, since it is larger than the sum of its proper divisors (60201729).

115667991 is a wasteful number, since it uses less digits than its factorization.

115667991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676446 (or 676443 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 115667991 is about 10754.9054389148. The cubic root of 115667991 is about 487.2341619659.

The spelling of 115667991 in words is "one hundred fifteen million, six hundred sixty-seven thousand, nine hundred ninety-one".