90840559 has 2 divisors, whose sum is σ = 90840560. Its totient is φ = 90840558.

The previous prime is 90840527. The next prime is 90840601. The reversal of 90840559 is 95504809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90840559 - 2⁵ = 90840527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90840059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420279 + 45420280.

It is an arithmetic number, because the mean of its divisors is an integer number (45420280).

Almost surely, 2^90840559 is an apocalyptic number.

90840559 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840559 is an equidigital number, since it uses as much as digits as its factorization.

90840559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 90840559 is about 9531.0313712630. The cubic root of 90840559 is about 449.5312963469.

The spelling of 90840559 in words is "ninety million, eight hundred forty thousand, five hundred fifty-nine".