90890897 has 2 divisors, whose sum is σ = 90890898. Its totient is φ = 90890896.

The previous prime is 90890867. The next prime is 90890909. The reversal of 90890897 is 79809809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51251281 + 39639616 = 7159^2 + 6296^2 .

It is a cyclic number.

It is not a de Polignac number, because 90890897 - 2¹² = 90886801 is a prime.

It is a super-2 number, since 2×90890897² = 16522310314929218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90890837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45445448 + 45445449.

It is an arithmetic number, because the mean of its divisors is an integer number (45445449).

Almost surely, 2^90890897 is an apocalyptic number.

It is an amenable number.

90890897 is a deficient number, since it is larger than the sum of its proper divisors (1).

90890897 is an equidigital number, since it uses as much as digits as its factorization.

90890897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 90890897 is about 9533.6717480727. The cubic root of 90890897 is about 449.6143147995.

The spelling of 90890897 in words is "ninety million, eight hundred ninety thousand, eight hundred ninety-seven".