90173569 has 4 divisors (see below), whose sum is σ = 90388180. Its totient is φ = 89958960.

The previous prime is 90173561. The next prime is 90173579. The reversal of 90173569 is 96537109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96537109 = 569 ⋅169661.

It can be written as a sum of positive squares in 2 ways, for example, as 18601969 + 71571600 = 4313^2 + 8460^2 .

It is a cyclic number.

It is not a de Polignac number, because 90173569 - 2³ = 90173561 is a prime.

It is a super-2 number, since 2×90173569² = 16262545092395522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90173561) 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, 106674 + ... + 107515.

It is an arithmetic number, because the mean of its divisors is an integer number (22597045).

Almost surely, 2^90173569 is an apocalyptic number.

It is an amenable number.

90173569 is a deficient number, since it is larger than the sum of its proper divisors (214611).

90173569 is a wasteful number, since it uses less digits than its factorization.

90173569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214610.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 90173569 is about 9495.9764637451. The cubic root of 90173569 is about 448.4283759324.

The spelling of 90173569 in words is "ninety million, one hundred seventy-three thousand, five hundred sixty-nine".