91169861 has 16 divisors (see below), whose sum is σ = 101150208. Its totient is φ = 81734400.

The previous prime is 91169851. The next prime is 91169863. The reversal of 91169861 is 16896119.

91169861 = T₄₇₈ + T₄₇₉ + ... + T₈₆₈.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91169861 - 2²⁶ = 24060997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91169863) 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, 168251 + ... + 168791.

It is an arithmetic number, because the mean of its divisors is an integer number (6321888).

Almost surely, 2^91169861 is an apocalyptic number.

It is an amenable number.

91169861 is a deficient number, since it is larger than the sum of its proper divisors (9980347).

91169861 is a wasteful number, since it uses less digits than its factorization.

91169861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its digits is 23328, while the sum is 41.

The square root of 91169861 is about 9548.2909989170. The cubic root of 91169861 is about 450.0738331528.

The spelling of 91169861 in words is "ninety-one million, one hundred sixty-nine thousand, eight hundred sixty-one".