91921488 has 20 divisors (see below), whose sum is σ = 237463968. Its totient is φ = 30640480.

The previous prime is 91921481. The next prime is 91921559. The reversal of 91921488 is 88412919.

It is a super-2 number, since 2×91921488² = 16899119912268288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91921481) 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 3 ways as a sum of consecutive naturals, for example, 957468 + ... + 957563.

Almost surely, 2^91921488 is an apocalyptic number.

It is an amenable number.

91921488 is an abundant number, since it is smaller than the sum of its proper divisors (145542480).

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

91921488 is a wasteful number, since it uses less digits than its factorization.

91921488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915042 (or 1915036 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 91921488 is about 9587.5694521604. The cubic root of 91921488 is about 451.3072898874.

The spelling of 91921488 in words is "ninety-one million, nine hundred twenty-one thousand, four hundred eighty-eight".