90218459 has 2 divisors, whose sum is σ = 90218460. Its totient is φ = 90218458.

The previous prime is 90218413. The next prime is 90218461. The reversal of 90218459 is 95481209.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90218459 - 2²⁴ = 73441243 is a prime.

Together with 90218461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90218059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45109229 + 45109230.

It is an arithmetic number, because the mean of its divisors is an integer number (45109230).

Almost surely, 2^90218459 is an apocalyptic number.

90218459 is a deficient number, since it is larger than the sum of its proper divisors (1).

90218459 is an equidigital number, since it uses as much as digits as its factorization.

90218459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 90218459 is about 9498.3398023023. The cubic root of 90218459 is about 448.5027754510.

The spelling of 90218459 in words is "ninety million, two hundred eighteen thousand, four hundred fifty-nine".