19902017 has 2 divisors, whose sum is σ = 19902018. Its totient is φ = 19902016.

The previous prime is 19902013. The next prime is 19902023. The reversal of 19902017 is 71020991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 152881 = 4444^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 19902017 - 2² = 19902013 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19902011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9951008 + 9951009.

It is an arithmetic number, because the mean of its divisors is an integer number (9951009).

Almost surely, 2^19902017 is an apocalyptic number.

It is an amenable number.

19902017 is a deficient number, since it is larger than the sum of its proper divisors (1).

19902017 is an equidigital number, since it uses as much as digits as its factorization.

19902017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 19902017 is about 4461.1676722580. The cubic root of 19902017 is about 270.9977578188.

The spelling of 19902017 in words is "nineteen million, nine hundred two thousand, seventeen".