90284189 has 2 divisors, whose sum is σ = 90284190. Its totient is φ = 90284188.

The previous prime is 90284179. The next prime is 90284191. The reversal of 90284189 is 98148209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 27478564 = 7925^2 + 5242^2 .

It is a cyclic number.

It is not a de Polignac number, because 90284189 - 2⁸ = 90283933 is a prime.

Together with 90284191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90284119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45142094 + 45142095.

It is an arithmetic number, because the mean of its divisors is an integer number (45142095).

Almost surely, 2^90284189 is an apocalyptic number.

It is an amenable number.

90284189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90284189 is an equidigital number, since it uses as much as digits as its factorization.

90284189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 90284189 is about 9501.7992506683. The cubic root of 90284189 is about 448.6116701320.

The spelling of 90284189 in words is "ninety million, two hundred eighty-four thousand, one hundred eighty-nine".