91921120 has 24 divisors (see below), whose sum is σ = 217164024. Its totient is φ = 36768384.

The previous prime is 91921103. The next prime is 91921121. The reversal of 91921120 is 2112919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91921121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287094 + ... + 287413.

It is an arithmetic number, because the mean of its divisors is an integer number (9048501).

Almost surely, 2^91921120 is an apocalyptic number.

It is an amenable number.

91921120 is an abundant number, since it is smaller than the sum of its proper divisors (125242904).

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

91921120 is a wasteful number, since it uses less digits than its factorization.

91921120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574522 (or 574514 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 91921120 is about 9587.5502606245. The cubic root of 91921120 is about 451.3066876296.

The spelling of 91921120 in words is "ninety-one million, nine hundred twenty-one thousand, one hundred twenty".