194404121 has 2 divisors, whose sum is σ = 194404122. Its totient is φ = 194404120.

The previous prime is 194404117. The next prime is 194404187. The reversal of 194404121 is 121404491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170589721 + 23814400 = 13061^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 194404121 - 2² = 194404117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (194404921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97202060 + 97202061.

It is an arithmetic number, because the mean of its divisors is an integer number (97202061).

Almost surely, 2^194404121 is an apocalyptic number.

It is an amenable number.

194404121 is a deficient number, since it is larger than the sum of its proper divisors (1).

194404121 is an equidigital number, since it uses as much as digits as its factorization.

194404121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 194404121 is about 13942.8878285669. The cubic root of 194404121 is about 579.2977241313.

The spelling of 194404121 in words is "one hundred ninety-four million, four hundred four thousand, one hundred twenty-one".