90291569 has 2 divisors, whose sum is σ = 90291570. Its totient is φ = 90291568.

The previous prime is 90291563. The next prime is 90291599. The reversal of 90291569 is 96519209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83028544 + 7263025 = 9112^2 + 2695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90291569 is a prime.

It is a super-2 number, since 2×90291569² = 16305134864963522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90291563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45145784 + 45145785.

It is an arithmetic number, because the mean of its divisors is an integer number (45145785).

Almost surely, 2^90291569 is an apocalyptic number.

It is an amenable number.

90291569 is a deficient number, since it is larger than the sum of its proper divisors (1).

90291569 is an equidigital number, since it uses as much as digits as its factorization.

90291569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 90291569 is about 9502.1875902342. The cubic root of 90291569 is about 448.6238932538.

The spelling of 90291569 in words is "ninety million, two hundred ninety-one thousand, five hundred sixty-nine".