90997 has 2 divisors, whose sum is σ = 90998. Its totient is φ = 90996.

The previous prime is 90989. The next prime is 91009. The reversal of 90997 is 79909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53361 + 37636 = 231^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 90997 - 2³ = 90989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45498 + 45499.

It is an arithmetic number, because the mean of its divisors is an integer number (45499).

2⁹⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

90997 is a deficient number, since it is larger than the sum of its proper divisors (1).

90997 is an equidigital number, since it uses as much as digits as its factorization.

90997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 90997 is about 301.6570900874. The cubic root of 90997 is about 44.9789201680.

Adding to 90997 its product of nonzero digits (5103), we get a square (96100 = 310²).

The spelling of 90997 in words is "ninety thousand, nine hundred ninety-seven".