89916181 has 4 divisors (see below), whose sum is σ = 90563200. Its totient is φ = 89269164.

The previous prime is 89916161. The next prime is 89916199. The reversal of 89916181 is 18161998.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 89916181 - 2⁵ = 89916149 is a prime.

It is a super-2 number, since 2×89916181² = 16169839211249522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89916161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323301 + ... + 323578.

It is an arithmetic number, because the mean of its divisors is an integer number (22640800).

Almost surely, 2^89916181 is an apocalyptic number.

It is an amenable number.

89916181 is a deficient number, since it is larger than the sum of its proper divisors (647019).

89916181 is a wasteful number, since it uses less digits than its factorization.

89916181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647018.

The product of its digits is 31104, while the sum is 43.

The square root of 89916181 is about 9482.4143022756. The cubic root of 89916181 is about 448.0013103836.

The spelling of 89916181 in words is "eighty-nine million, nine hundred sixteen thousand, one hundred eighty-one".