991170115 has 16 divisors (see below), whose sum is σ = 1281772800. Its totient is φ = 731440512.

The previous prime is 991170113. The next prime is 991170137. The reversal of 991170115 is 511071199.

It is a cyclic number.

It is not a de Polignac number, because 991170115 - 2¹ = 991170113 is a prime.

It is a super-2 number, since 2×991170115² = 1964836393738226450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991170113) 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, 110001 + ... + 118669.

It is an arithmetic number, because the mean of its divisors is an integer number (80110800).

Almost surely, 2^991170115 is an apocalyptic number.

991170115 is a deficient number, since it is larger than the sum of its proper divisors (290602685).

991170115 is a wasteful number, since it uses less digits than its factorization.

991170115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10446.

The product of its (nonzero) digits is 2835, while the sum is 34.

The square root of 991170115 is about 31482.8543019848. The cubic root of 991170115 is about 997.0479992666.

The spelling of 991170115 in words is "nine hundred ninety-one million, one hundred seventy thousand, one hundred fifteen".