91231896 has 128 divisors (see below), whose sum is σ = 271941120. Its totient is φ = 24966144.

The previous prime is 91231891. The next prime is 91231919. The reversal of 91231896 is 69813219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91231891) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 527266 + ... + 527438.

It is an arithmetic number, because the mean of its divisors is an integer number (2124540).

Almost surely, 2^91231896 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 91231896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135970560).

91231896 is an abundant number, since it is smaller than the sum of its proper divisors (180709224).

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

91231896 is a wasteful number, since it uses less digits than its factorization.

91231896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 301 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 91231896 is about 9551.5389335960. The cubic root of 91231896 is about 450.1758917340.

The spelling of 91231896 in words is "ninety-one million, two hundred thirty-one thousand, eight hundred ninety-six".