90218413 has 2 divisors, whose sum is σ = 90218414. Its totient is φ = 90218412.

The previous prime is 90218369. The next prime is 90218459. The reversal of 90218413 is 31481209.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67207204 + 23011209 = 8198^2 + 4797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90218413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90213413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45109206 + 45109207.

It is an arithmetic number, because the mean of its divisors is an integer number (45109207).

Almost surely, 2^90218413 is an apocalyptic number.

It is an amenable number.

90218413 is a deficient number, since it is larger than the sum of its proper divisors (1).

90218413 is an equidigital number, since it uses as much as digits as its factorization.

90218413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 90218413 is about 9498.3373808262. The cubic root of 90218413 is about 448.5026992244.

The spelling of 90218413 in words is "ninety million, two hundred eighteen thousand, four hundred thirteen".