91001232 has 150 divisors (see below), whose sum is σ = 306599238. Its totient is φ = 25982208.

The previous prime is 91001227. The next prime is 91001243. The reversal of 91001232 is 23210019.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 86936976 + 4064256 = 9324^2 + 2016^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 62788 + ... + 64220.

Almost surely, 2^91001232 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 91001232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153299619).

91001232 is an abundant number, since it is smaller than the sum of its proper divisors (215598006).

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

91001232 is a wasteful number, since it uses less digits than its factorization.

91001232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 91001232 is about 9539.4565882968. The cubic root of 91001232 is about 449.7961743586.

The spelling of 91001232 in words is "ninety-one million, one thousand, two hundred thirty-two".