91451332 has 48 divisors (see below), whose sum is σ = 193459840. Its totient is φ = 36951552.

The previous prime is 91451329. The next prime is 91451363. The reversal of 91451332 is 23315419.

It is a super-2 number, since 2×91451332² = 16726692249148448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 91451332.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210988 + ... + 211420.

Almost surely, 2^91451332 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 91451332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96729920).

91451332 is an abundant number, since it is smaller than the sum of its proper divisors (102008508).

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

91451332 is a wasteful number, since it uses less digits than its factorization.

91451332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 858 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 91451332 is about 9563.0189793809. The cubic root of 91451332 is about 450.5365320586.

The spelling of 91451332 in words is "ninety-one million, four hundred fifty-one thousand, three hundred thirty-two".