91009098 has 24 divisors (see below), whose sum is σ = 197660736. Its totient is φ = 30263400.

The previous prime is 91009081. The next prime is 91009123. The reversal of 91009098 is 89090019.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1893 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (8235864).

Almost surely, 2^91009098 is an apocalyptic number.

91009098 is an abundant number, since it is smaller than the sum of its proper divisors (106651638).

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

91009098 is a wasteful number, since it uses less digits than its factorization.

91009098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12170 (or 12167 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 91009098 is about 9539.8688670233. The cubic root of 91009098 is about 449.8091338710.

The spelling of 91009098 in words is "ninety-one million, nine thousand, ninety-eight".