90345217 has 2 divisors, whose sum is σ = 90345218. Its totient is φ = 90345216.

The previous prime is 90345197. The next prime is 90345257. The reversal of 90345217 is 71254309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80353296 + 9991921 = 8964^2 + 3161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90345217 is a prime.

It is not a weakly prime, because it can be changed into another prime (90345257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45172608 + 45172609.

It is an arithmetic number, because the mean of its divisors is an integer number (45172609).

Almost surely, 2^90345217 is an apocalyptic number.

It is an amenable number.

90345217 is a deficient number, since it is larger than the sum of its proper divisors (1).

90345217 is an equidigital number, since it uses as much as digits as its factorization.

90345217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 90345217 is about 9505.0100999420. The cubic root of 90345217 is about 448.7127277180.

The spelling of 90345217 in words is "ninety million, three hundred forty-five thousand, two hundred seventeen".