91685769 has 16 divisors (see below), whose sum is σ = 140497920. Its totient is φ = 52097040.

The previous prime is 91685729. The next prime is 91685807. The reversal of 91685769 is 96758619.

It is not a de Polignac number, because 91685769 - 2¹⁶ = 91620233 is a prime.

It is a super-2 number, since 2×91685769² = 16812560474242722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91685719) 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, 8437 + ... + 15954.

It is an arithmetic number, because the mean of its divisors is an integer number (8781120).

Almost surely, 2^91685769 is an apocalyptic number.

It is an amenable number.

91685769 is a deficient number, since it is larger than the sum of its proper divisors (48812151).

91685769 is a wasteful number, since it uses less digits than its factorization.

91685769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24580.

The product of its digits is 816480, while the sum is 51.

The square root of 91685769 is about 9575.2686124202. The cubic root of 91685769 is about 450.9211895007.

The spelling of 91685769 in words is "ninety-one million, six hundred eighty-five thousand, seven hundred sixty-nine".