890865005117 has 2 divisors, whose sum is σ = 890865005118. Its totient is φ = 890865005116.

The previous prime is 890865005099. The next prime is 890865005209. The reversal of 890865005117 is 711500568098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846526964761 + 44338040356 = 920069^2 + 210566^2 .

It is a cyclic number.

It is not a de Polignac number, because 890865005117 - 2³⁸ = 615987098173 is a prime.

It is a super-2 number, since 2×890865005117² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890865005717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445432502558 + 445432502559.

It is an arithmetic number, because the mean of its divisors is an integer number (445432502559).

Almost surely, 2^890865005117 is an apocalyptic number.

It is an amenable number.

890865005117 is a deficient number, since it is larger than the sum of its proper divisors (1).

890865005117 is an equidigital number, since it uses as much as digits as its factorization.

890865005117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 50.

The spelling of 890865005117 in words is "eight hundred ninety billion, eight hundred sixty-five million, five thousand, one hundred seventeen".