90997253 has 2 divisors, whose sum is σ = 90997254. Its totient is φ = 90997252.

The previous prime is 90997241. The next prime is 90997259. The reversal of 90997253 is 35279909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53260804 + 37736449 = 7298^2 + 6143^2 .

It is a cyclic number.

It is not a de Polignac number, because 90997253 - 2¹⁶ = 90931717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90997259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45498626 + 45498627.

It is an arithmetic number, because the mean of its divisors is an integer number (45498627).

Almost surely, 2^90997253 is an apocalyptic number.

It is an amenable number.

90997253 is a deficient number, since it is larger than the sum of its proper divisors (1).

90997253 is an equidigital number, since it uses as much as digits as its factorization.

90997253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 44.

The square root of 90997253 is about 9539.2480311605. The cubic root of 90997253 is about 449.7896185314.

The spelling of 90997253 in words is "ninety million, nine hundred ninety-seven thousand, two hundred fifty-three".