89181819 has 6 divisors (see below), whose sum is σ = 128818196. Its totient is φ = 59454540.

The previous prime is 89181793. The next prime is 89181857. The reversal of 89181819 is 91818198.

It is not a de Polignac number, because 89181819 - 2¹³ = 89173627 is a prime.

It is a super-2 number, since 2×89181819² = 15906793680297522, which contains 22 as substring.

It is a Duffinian number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4954537 + ... + 4954554.

Almost surely, 2^89181819 is an apocalyptic number.

89181819 is a deficient number, since it is larger than the sum of its proper divisors (39636377).

89181819 is a wasteful number, since it uses less digits than its factorization.

89181819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909097 (or 9909094 counting only the distinct ones).

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

The square root of 89181819 is about 9443.6126032361. The cubic root of 89181819 is about 446.7783385174.

It can be divided in two parts, 89181 and 819, that added together give a square (90000 = 300²).

The spelling of 89181819 in words is "eighty-nine million, one hundred eighty-one thousand, eight hundred nineteen".