91409598 has 72 divisors (see below), whose sum is σ = 234304200. Its totient is φ = 25673760.

The previous prime is 91409579. The next prime is 91409671. The reversal of 91409598 is 89590419.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 52953 + ... + 54651.

It is an arithmetic number, because the mean of its divisors is an integer number (3254225).

Almost surely, 2^91409598 is an apocalyptic number.

91409598 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91409598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117152100).

91409598 is an abundant number, since it is smaller than the sum of its proper divisors (142894602).

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

91409598 is a wasteful number, since it uses less digits than its factorization.

91409598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1772 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 91409598 is about 9560.8366788686. The cubic root of 91409598 is about 450.4679872120.

The spelling of 91409598 in words is "ninety-one million, four hundred nine thousand, five hundred ninety-eight".