90084857 has 2 divisors, whose sum is σ = 90084858. Its totient is φ = 90084856.

The previous prime is 90084851. The next prime is 90084877. The reversal of 90084857 is 75848009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90079081 + 5776 = 9491^2 + 76^2 .

It is an emirp because it is prime and its reverse (75848009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90084857 - 2²⁰ = 89036281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90084851) 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, 45042428 + 45042429.

It is an arithmetic number, because the mean of its divisors is an integer number (45042429).

Almost surely, 2^90084857 is an apocalyptic number.

It is an amenable number.

90084857 is a deficient number, since it is larger than the sum of its proper divisors (1).

90084857 is an equidigital number, since it uses as much as digits as its factorization.

90084857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 90084857 is about 9491.3042833954. The cubic root of 90084857 is about 448.2812743258.

The spelling of 90084857 in words is "ninety million, eighty-four thousand, eight hundred fifty-seven".