90204133 has 4 divisors (see below), whose sum is σ = 90662220. Its totient is φ = 89746048.

The previous prime is 90204119. The next prime is 90204161. The reversal of 90204133 is 33140209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33140209 = 31 ⋅1069039.

It can be written as a sum of positive squares in 2 ways, for example, as 46881409 + 43322724 = 6847^2 + 6582^2 .

It is a cyclic number.

It is not a de Polignac number, because 90204133 - 2²¹ = 88106981 is a prime.

It is a super-2 number, since 2×90204133² = 16273571220563378, 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 (90264133) 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, 228748 + ... + 229141.

It is an arithmetic number, because the mean of its divisors is an integer number (22665555).

Almost surely, 2^90204133 is an apocalyptic number.

It is an amenable number.

90204133 is a deficient number, since it is larger than the sum of its proper divisors (458087).

90204133 is a wasteful number, since it uses less digits than its factorization.

90204133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458086.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 90204133 is about 9497.5856405720. The cubic root of 90204133 is about 448.4790345929.

The spelling of 90204133 in words is "ninety million, two hundred four thousand, one hundred thirty-three".