90018169 has 8 divisors (see below), whose sum is σ = 91105992. Its totient is φ = 88934400.

The previous prime is 90018167. The next prime is 90018191. The reversal of 90018169 is 96181009.

It can be written as a sum of positive squares in 4 ways, for example, as 26656569 + 63361600 = 5163^2 + 7960^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90018169 - 2¹ = 90018167 is a prime.

It is a super-2 number, since 2×90018169² = 16206541500225122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90018161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77497 + ... + 78649.

It is an arithmetic number, because the mean of its divisors is an integer number (11388249).

Almost surely, 2^90018169 is an apocalyptic number.

It is an amenable number.

90018169 is a deficient number, since it is larger than the sum of its proper divisors (1087823).

90018169 is a wasteful number, since it uses less digits than its factorization.

90018169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 90018169 is about 9487.7905225611. The cubic root of 90018169 is about 448.1706291610.

The spelling of 90018169 in words is "ninety million, eighteen thousand, one hundred sixty-nine".