91149090 has 32 divisors (see below), whose sum is σ = 221844096. Its totient is φ = 23963520.

The previous prime is 91149089. The next prime is 91149169. The reversal of 91149090 is 9094119.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19267 + ... + 23526.

It is an arithmetic number, because the mean of its divisors is an integer number (6932628).

Almost surely, 2^91149090 is an apocalyptic number.

91149090 is an abundant number, since it is smaller than the sum of its proper divisors (130695006).

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

91149090 is a wasteful number, since it uses less digits than its factorization.

91149090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42874.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 91149090 is about 9547.2032554042. The cubic root of 91149090 is about 450.0396508271.

The spelling of 91149090 in words is "ninety-one million, one hundred forty-nine thousand, ninety".