221195617 has 2 divisors, whose sum is σ = 221195618. Its totient is φ = 221195616.

The previous prime is 221195593. The next prime is 221195627. The reversal of 221195617 is 716591122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198499921 + 22695696 = 14089^2 + 4764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221195617 is a prime.

It is not a weakly prime, because it can be changed into another prime (221195627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110597808 + 110597809.

It is an arithmetic number, because the mean of its divisors is an integer number (110597809).

Almost surely, 2^221195617 is an apocalyptic number.

It is an amenable number.

221195617 is a deficient number, since it is larger than the sum of its proper divisors (1).

221195617 is an equidigital number, since it uses as much as digits as its factorization.

221195617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 221195617 is about 14872.6466037488. The cubic root of 221195617 is about 604.7726915122.

The spelling of 221195617 in words is "two hundred twenty-one million, one hundred ninety-five thousand, six hundred seventeen".