91912500 has 216 divisors, whose sum is σ = 312792480. Its totient is φ = 22680000.

The previous prime is 91912487. The next prime is 91912511. The reversal of 91912500 is 521919.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2137479 + ... + 2137521.

Almost surely, 2^91912500 is an apocalyptic number.

91912500 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91912500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156396240).

91912500 is an abundant number, since it is smaller than the sum of its proper divisors (220879980).

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

91912500 is a wasteful number, since it uses less digits than its factorization.

91912500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 91912500 is about 9587.1007087649. The cubic root of 91912500 is about 451.2925799350.

The spelling of 91912500 in words is "ninety-one million, nine hundred twelve thousand, five hundred".