17220565231 has 2 divisors, whose sum is σ = 17220565232. Its totient is φ = 17220565230.

The previous prime is 17220565213. The next prime is 17220565237. The reversal of 17220565231 is 13256502271.

Together with previous prime (17220565213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13256502271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17220565231 - 2⁹ = 17220564719 is a prime.

It is a super-2 number, since 2×17220565231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17220565237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8610282615 + 8610282616.

It is an arithmetic number, because the mean of its divisors is an integer number (8610282616).

Almost surely, 2^17220565231 is an apocalyptic number.

17220565231 is a deficient number, since it is larger than the sum of its proper divisors (1).

17220565231 is an equidigital number, since it uses as much as digits as its factorization.

17220565231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 17220565231 in words is "seventeen billion, two hundred twenty million, five hundred sixty-five thousand, two hundred thirty-one".