90840017 has 2 divisors, whose sum is σ = 90840018. Its totient is φ = 90840016.

The previous prime is 90839953. The next prime is 90840019. The reversal of 90840017 is 71004809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86694721 + 4145296 = 9311^2 + 2036^2 .

It is an emirp because it is prime and its reverse (71004809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90840017 - 2⁶ = 90839953 is a prime.

Together with 90840019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90840019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420008 + 45420009.

It is an arithmetic number, because the mean of its divisors is an integer number (45420009).

Almost surely, 2^90840017 is an apocalyptic number.

It is an amenable number.

90840017 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840017 is an equidigital number, since it uses as much as digits as its factorization.

90840017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 90840017 is about 9531.0029377815. The cubic root of 90840017 is about 449.5304023027.

The spelling of 90840017 in words is "ninety million, eight hundred forty thousand, seventeen".