89409891 has 8 divisors (see below), whose sum is σ = 119323840. Its totient is φ = 59551272.

The previous prime is 89409869. The next prime is 89409907. The reversal of 89409891 is 19890498.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-89409891 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 89409891.

It is not an unprimeable number, because it can be changed into a prime (89409811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9901 + ... + 16638.

It is an arithmetic number, because the mean of its divisors is an integer number (14915480).

Almost surely, 2^89409891 is an apocalyptic number.

89409891 is a deficient number, since it is larger than the sum of its proper divisors (29913949).

89409891 is a wasteful number, since it uses less digits than its factorization.

89409891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27665.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 89409891 is about 9455.6803562726. The cubic root of 89409891 is about 447.1588753048.

The spelling of 89409891 in words is "eighty-nine million, four hundred nine thousand, eight hundred ninety-one".