90002189 has 2 divisors, whose sum is σ = 90002190. Its totient is φ = 90002188.

The previous prime is 90002179. The next prime is 90002201. The reversal of 90002189 is 98120009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71149225 + 18852964 = 8435^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 90002189 - 2¹² = 89998093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90002149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45001094 + 45001095.

It is an arithmetic number, because the mean of its divisors is an integer number (45001095).

Almost surely, 2^90002189 is an apocalyptic number.

It is an amenable number.

90002189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90002189 is an equidigital number, since it uses as much as digits as its factorization.

90002189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 90002189 is about 9486.9483502336. The cubic root of 90002189 is about 448.1441078837.

The spelling of 90002189 in words is "ninety million, two thousand, one hundred eighty-nine".