91380924 has 18 divisors (see below), whose sum is σ = 230990760. Its totient is φ = 30460296.

The previous prime is 91380917. The next prime is 91380941. The reversal of 91380924 is 42908319.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2538359 = 91380924 / (9 + 1 + 3 + 8 + 0 + 9 + 2 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1269144 + ... + 1269215.

It is an arithmetic number, because the mean of its divisors is an integer number (12832820).

Almost surely, 2^91380924 is an apocalyptic number.

It is an amenable number.

91380924 is an abundant number, since it is smaller than the sum of its proper divisors (139609836).

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

91380924 is a wasteful number, since it uses less digits than its factorization.

91380924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538369 (or 2538364 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 91380924 is about 9559.3370062991. The cubic root of 91380924 is about 450.4208803064.

The spelling of 91380924 in words is "ninety-one million, three hundred eighty thousand, nine hundred twenty-four".