89136921 has 16 divisors (see below), whose sum is σ = 121996160. Its totient is φ = 57870720.

The previous prime is 89136919. The next prime is 89136989. The reversal of 89136921 is 12963198.

It is not a de Polignac number, because 89136921 - 2¹ = 89136919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89136921.

It is not an unprimeable number, because it can be changed into a prime (89136521) 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, 16485 + ... + 21213.

It is an arithmetic number, because the mean of its divisors is an integer number (7624760).

Almost surely, 2^89136921 is an apocalyptic number.

It is an amenable number.

89136921 is a deficient number, since it is larger than the sum of its proper divisors (32859239).

89136921 is a wasteful number, since it uses less digits than its factorization.

89136921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896.

The product of its digits is 23328, while the sum is 39.

The square root of 89136921 is about 9441.2351416539. The cubic root of 89136921 is about 446.7033500602.

The spelling of 89136921 in words is "eighty-nine million, one hundred thirty-six thousand, nine hundred twenty-one".