90498209 has 2 divisors, whose sum is σ = 90498210. Its totient is φ = 90498208.

The previous prime is 90498131. The next prime is 90498217. The reversal of 90498209 is 90289409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52243984 + 38254225 = 7228^2 + 6185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90498209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90498229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45249104 + 45249105.

It is an arithmetic number, because the mean of its divisors is an integer number (45249105).

Almost surely, 2^90498209 is an apocalyptic number.

It is an amenable number.

90498209 is a deficient number, since it is larger than the sum of its proper divisors (1).

90498209 is an equidigital number, since it uses as much as digits as its factorization.

90498209 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 41.

The square root of 90498209 is about 9513.0546618844. The cubic root of 90498209 is about 448.9658705910.

The spelling of 90498209 in words is "ninety million, four hundred ninety-eight thousand, two hundred nine".