890395572217 has 2 divisors, whose sum is σ = 890395572218. Its totient is φ = 890395572216.

The previous prime is 890395572181. The next prime is 890395572271. The reversal of 890395572217 is 712275593098.

It is a happy number.

Together with next prime (890395572271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 871289698041 + 19105874176 = 933429^2 + 138224^2 .

It is a cyclic number.

It is not a de Polignac number, because 890395572217 - 2³¹ = 888248088569 is a prime.

It is not a weakly prime, because it can be changed into another prime (890395575217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445197786108 + 445197786109.

It is an arithmetic number, because the mean of its divisors is an integer number (445197786109).

Almost surely, 2^890395572217 is an apocalyptic number.

It is an amenable number.

890395572217 is a deficient number, since it is larger than the sum of its proper divisors (1).

890395572217 is an equidigital number, since it uses as much as digits as its factorization.

890395572217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9525600, while the sum is 58.

The spelling of 890395572217 in words is "eight hundred ninety billion, three hundred ninety-five million, five hundred seventy-two thousand, two hundred seventeen".