89908181 has 4 divisors (see below), whose sum is σ = 98081664. Its totient is φ = 81734700.

The previous prime is 89908151. The next prime is 89908199. The reversal of 89908181 is 18180998.

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 89908181 - 2¹⁰ = 89907157 is a prime.

It is a super-2 number, since 2×89908181² = 16166962021457522, 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 (89908151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4086725 + ... + 4086746.

It is an arithmetic number, because the mean of its divisors is an integer number (24520416).

Almost surely, 2^89908181 is an apocalyptic number.

It is an amenable number.

89908181 is a deficient number, since it is larger than the sum of its proper divisors (8173483).

89908181 is a wasteful number, since it uses less digits than its factorization.

89908181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8173482.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 89908181 is about 9481.9924593938. The cubic root of 89908181 is about 447.9880235026.

It can be divided in two parts, 8990 and 8181, that added together give a palindrome (17171).

The spelling of 89908181 in words is "eighty-nine million, nine hundred eight thousand, one hundred eighty-one".