91551488 has 72 divisors (see below), whose sum is σ = 213491712. Its totient is φ = 38366208.

The previous prime is 91551487. The next prime is 91551503. The reversal of 91551488 is 88415519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91551487) 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 7 ways as a sum of consecutive naturals, for example, 83681 + ... + 84767.

Almost surely, 2^91551488 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 91551488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106745856).

91551488 is an abundant number, since it is smaller than the sum of its proper divisors (121940224).

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

91551488 is a wasteful number, since it uses less digits than its factorization.

91551488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1143 counting only the distinct ones).

The product of its digits is 57600, while the sum is 41.

The square root of 91551488 is about 9568.2541772259. The cubic root of 91551488 is about 450.7009454609.

The spelling of 91551488 in words is "ninety-one million, five hundred fifty-one thousand, four hundred eighty-eight".