90089189 has 2 divisors, whose sum is σ = 90089190. Its totient is φ = 90089188.

The previous prime is 90089179. The next prime is 90089213. The reversal of 90089189 is 98198009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87422500 + 2666689 = 9350^2 + 1633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90089189 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90089159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45044594 + 45044595.

It is an arithmetic number, because the mean of its divisors is an integer number (45044595).

Almost surely, 2^90089189 is an apocalyptic number.

It is an amenable number.

90089189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90089189 is an equidigital number, since it uses as much as digits as its factorization.

90089189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 90089189 is about 9491.5324895403. The cubic root of 90089189 is about 448.2884598596.

The spelling of 90089189 in words is "ninety million, eighty-nine thousand, one hundred eighty-nine".