91811552 has 48 divisors (see below), whose sum is σ = 210107520. Its totient is φ = 38675328.

The previous prime is 91811549. The next prime is 91811563. The reversal of 91811552 is 25511819.

It is a super-2 number, since 2×91811552² = 16858722161297408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9743 + ... + 16689.

It is an arithmetic number, because the mean of its divisors is an integer number (4377240).

Almost surely, 2^91811552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91811552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105053760).

91811552 is an abundant number, since it is smaller than the sum of its proper divisors (118295968).

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

91811552 is a wasteful number, since it uses less digits than its factorization.

91811552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023 (or 7015 counting only the distinct ones).

The product of its digits is 3600, while the sum is 32.

The square root of 91811552 is about 9581.8344798895. The cubic root of 91811552 is about 451.1273003772.

The spelling of 91811552 in words is "ninety-one million, eight hundred eleven thousand, five hundred fifty-two".