90857219 has 2 divisors, whose sum is σ = 90857220. Its totient is φ = 90857218.

The previous prime is 90857213. The next prime is 90857269. The reversal of 90857219 is 91275809.

It is a weak prime.

It is an emirp because it is prime and its reverse (91275809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90857219 - 2⁸ = 90856963 is a prime.

It is a super-2 number, since 2×90857219² = 16510068488827922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (90857213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45428609 + 45428610.

It is an arithmetic number, because the mean of its divisors is an integer number (45428610).

Almost surely, 2^90857219 is an apocalyptic number.

90857219 is a deficient number, since it is larger than the sum of its proper divisors (1).

90857219 is an equidigital number, since it uses as much as digits as its factorization.

90857219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 90857219 is about 9531.9053184555. The cubic root of 90857219 is about 449.5587757522.

The spelling of 90857219 in words is "ninety million, eight hundred fifty-seven thousand, two hundred nineteen".