89781169 has 4 divisors (see below), whose sum is σ = 90436644. Its totient is φ = 89125696.

The previous prime is 89781157. The next prime is 89781173. The reversal of 89781169 is 96118798.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 69639025 = 4488^2 + 8345^2 .

It is a cyclic number.

It is not a de Polignac number, because 89781169 - 2⁹ = 89780657 is a prime.

It is a super-2 number, since 2×89781169² = 16121316614013122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89781149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327532 + ... + 327805.

It is an arithmetic number, because the mean of its divisors is an integer number (22609161).

Almost surely, 2^89781169 is an apocalyptic number.

It is an amenable number.

89781169 is a deficient number, since it is larger than the sum of its proper divisors (655475).

89781169 is a wasteful number, since it uses less digits than its factorization.

89781169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655474.

The product of its digits is 217728, while the sum is 49.

The square root of 89781169 is about 9475.2925548502. The cubic root of 89781169 is about 447.7769686645.

The spelling of 89781169 in words is "eighty-nine million, seven hundred eighty-one thousand, one hundred sixty-nine".