194964221 has 2 divisors, whose sum is σ = 194964222. Its totient is φ = 194964220.

The previous prime is 194964199. The next prime is 194964241. The reversal of 194964221 is 122469491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191407225 + 3556996 = 13835^2 + 1886^2 .

It is an emirp because it is prime and its reverse (122469491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194964221 is a prime.

It is a super-2 number, since 2×194964221² = 76022094940273682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194964241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97482110 + 97482111.

It is an arithmetic number, because the mean of its divisors is an integer number (97482111).

Almost surely, 2^194964221 is an apocalyptic number.

It is an amenable number.

194964221 is a deficient number, since it is larger than the sum of its proper divisors (1).

194964221 is an equidigital number, since it uses as much as digits as its factorization.

194964221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 194964221 is about 13962.9588912952. The cubic root of 194964221 is about 579.8535311878.

The spelling of 194964221 in words is "one hundred ninety-four million, nine hundred sixty-four thousand, two hundred twenty-one".