91691544 has 48 divisors (see below), whose sum is σ = 266657400. Its totient is φ = 26197248.

The previous prime is 91691543. The next prime is 91691569. The reversal of 91691544 is 44519619.

It is a super-2 number, since 2×91691544² = 16814678482207872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91691543) 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 11 ways as a sum of consecutive naturals, for example, 37809 + ... + 40160.

Almost surely, 2^91691544 is an apocalyptic number.

It is an amenable number.

91691544 is an abundant number, since it is smaller than the sum of its proper divisors (174965856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91691544 is a wasteful number, since it uses less digits than its factorization.

91691544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77992 (or 77981 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 91691544 is about 9575.5701657917. The cubic root of 91691544 is about 450.9306566740.

It can be divided in two parts, 91691 and 544, that added together give a triangular number (92235 = T₄₂₉).

The spelling of 91691544 in words is "ninety-one million, six hundred ninety-one thousand, five hundred forty-four".