91866159 has 48 divisors (see below), whose sum is σ = 174170880. Its totient is φ = 45204480.

The previous prime is 91866149. The next prime is 91866167. The reversal of 91866159 is 95166819.

It is not a de Polignac number, because 91866159 - 2⁷ = 91866031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91866109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9679 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (3628560).

Almost surely, 2^91866159 is an apocalyptic number.

91866159 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

91866159 is a deficient number, since it is larger than the sum of its proper divisors (82304721).

91866159 is a wasteful number, since it uses less digits than its factorization.

91866159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7020 (or 7017 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 91866159 is about 9584.6835628517. The cubic root of 91866159 is about 451.2167220442.

The spelling of 91866159 in words is "ninety-one million, eight hundred sixty-six thousand, one hundred fifty-nine".