91800115 has 32 divisors (see below), whose sum is σ = 127837440. Its totient is φ = 62582400.

The previous prime is 91800113. The next prime is 91800131. The reversal of 91800115 is 51100819.

It is not a de Polignac number, because 91800115 - 2¹ = 91800113 is a prime.

It is a super-2 number, since 2×91800115² = 16854522228026450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91800115.

It is not an unprimeable number, because it can be changed into a prime (91800113) 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 31 ways as a sum of consecutive naturals, for example, 111405 + ... + 112225.

It is an arithmetic number, because the mean of its divisors is an integer number (3994920).

Almost surely, 2^91800115 is an apocalyptic number.

91800115 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

91800115 is a deficient number, since it is larger than the sum of its proper divisors (36037325).

91800115 is a wasteful number, since it uses less digits than its factorization.

91800115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 91800115 is about 9581.2376549170. The cubic root of 91800115 is about 451.1085672327.

The spelling of 91800115 in words is "ninety-one million, eight hundred thousand, one hundred fifteen".