220195817 has 2 divisors, whose sum is σ = 220195818. Its totient is φ = 220195816.

The previous prime is 220195793. The next prime is 220195837. The reversal of 220195817 is 718591022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176252176 + 43943641 = 13276^2 + 6629^2 .

It is a cyclic number.

It is not a de Polignac number, because 220195817 - 2¹² = 220191721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220195837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110097908 + 110097909.

It is an arithmetic number, because the mean of its divisors is an integer number (110097909).

Almost surely, 2^220195817 is an apocalyptic number.

It is an amenable number.

220195817 is a deficient number, since it is larger than the sum of its proper divisors (1).

220195817 is an equidigital number, since it uses as much as digits as its factorization.

220195817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 220195817 is about 14838.9964957203. The cubic root of 220195817 is about 603.8601281674.

The spelling of 220195817 in words is "two hundred twenty million, one hundred ninety-five thousand, eight hundred seventeen".