91530989 has 16 divisors (see below), whose sum is σ = 104569920. Its totient is φ = 79349760.

The previous prime is 91530953. The next prime is 91530991. The reversal of 91530989 is 98903519.

It is a cyclic number.

It is not a de Polignac number, because 91530989 - 2²⁴ = 74753773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91530919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24749 + ... + 28205.

It is an arithmetic number, because the mean of its divisors is an integer number (6535620).

Almost surely, 2^91530989 is an apocalyptic number.

It is an amenable number.

91530989 is a deficient number, since it is larger than the sum of its proper divisors (13038931).

91530989 is a wasteful number, since it uses less digits than its factorization.

91530989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 91530989 is about 9567.1829187071. The cubic root of 91530989 is about 450.6673046156.

The spelling of 91530989 in words is "ninety-one million, five hundred thirty thousand, nine hundred eighty-nine".