221695189 has 2 divisors, whose sum is σ = 221695190. Its totient is φ = 221695188.

The previous prime is 221695171. The next prime is 221695213. The reversal of 221695189 is 981596122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214856964 + 6838225 = 14658^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 221695189 - 2¹⁷ = 221564117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221699189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110847594 + 110847595.

It is an arithmetic number, because the mean of its divisors is an integer number (110847595).

Almost surely, 2^221695189 is an apocalyptic number.

It is an amenable number.

221695189 is a deficient number, since it is larger than the sum of its proper divisors (1).

221695189 is an equidigital number, since it uses as much as digits as its factorization.

221695189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 221695189 is about 14889.4321248327. The cubic root of 221695189 is about 605.2276437692.

The spelling of 221695189 in words is "two hundred twenty-one million, six hundred ninety-five thousand, one hundred eighty-nine".