89181891 has 20 divisors (see below), whose sum is σ = 135218952. Its totient is φ = 58563648.

The previous prime is 89181857. The next prime is 89181899. The reversal of 89181891 is 19818198.

It is not a de Polignac number, because 89181891 - 2¹⁴ = 89165507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89181899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2790 + ... + 13643.

Almost surely, 2^89181891 is an apocalyptic number.

89181891 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

89181891 is a deficient number, since it is larger than the sum of its proper divisors (46037061).

89181891 is a wasteful number, since it uses less digits than its factorization.

89181891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16512 (or 16503 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The square root of 89181891 is about 9443.6164153358. The cubic root of 89181891 is about 446.7784587513.

The spelling of 89181891 in words is "eighty-nine million, one hundred eighty-one thousand, eight hundred ninety-one".