90497189 has 2 divisors, whose sum is σ = 90497190. Its totient is φ = 90497188.

The previous prime is 90497161. The next prime is 90497213. The reversal of 90497189 is 98179409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 4656964 = 9265^2 + 2158^2 .

It is an emirp because it is prime and its reverse (98179409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90497189 - 2¹² = 90493093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90497149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45248594 + 45248595.

It is an arithmetic number, because the mean of its divisors is an integer number (45248595).

Almost surely, 2^90497189 is an apocalyptic number.

It is an amenable number.

90497189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90497189 is an equidigital number, since it uses as much as digits as its factorization.

90497189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 90497189 is about 9513.0010511930. The cubic root of 90497189 is about 448.9641838286.

The spelling of 90497189 in words is "ninety million, four hundred ninety-seven thousand, one hundred eighty-nine".