90297257 has 2 divisors, whose sum is σ = 90297258. Its totient is φ = 90297256.

The previous prime is 90297247. The next prime is 90297269. The reversal of 90297257 is 75279209.

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., 89794576 + 502681 = 9476^2 + 709^2 .

It is an emirp because it is prime and its reverse (75279209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90297257 - 2¹⁴ = 90280873 is a prime.

It is not a weakly prime, because it can be changed into another prime (90297247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45148628 + 45148629.

It is an arithmetic number, because the mean of its divisors is an integer number (45148629).

Almost surely, 2^90297257 is an apocalyptic number.

It is an amenable number.

90297257 is a deficient number, since it is larger than the sum of its proper divisors (1).

90297257 is an equidigital number, since it uses as much as digits as its factorization.

90297257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 90297257 is about 9502.4868850212. The cubic root of 90297257 is about 448.6333135469.

The spelling of 90297257 in words is "ninety million, two hundred ninety-seven thousand, two hundred fifty-seven".