90218273 has 2 divisors, whose sum is σ = 90218274. Its totient is φ = 90218272.

The previous prime is 90218231. The next prime is 90218309. The reversal of 90218273 is 37281209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89340304 + 877969 = 9452^2 + 937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90218273 is a prime.

It is not a weakly prime, because it can be changed into another prime (90218873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45109136 + 45109137.

It is an arithmetic number, because the mean of its divisors is an integer number (45109137).

Almost surely, 2^90218273 is an apocalyptic number.

It is an amenable number.

90218273 is a deficient number, since it is larger than the sum of its proper divisors (1).

90218273 is an equidigital number, since it uses as much as digits as its factorization.

90218273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 90218273 is about 9498.3300111125. The cubic root of 90218273 is about 448.5024672304.

The spelling of 90218273 in words is "ninety million, two hundred eighteen thousand, two hundred seventy-three".