194121143 has 2 divisors, whose sum is σ = 194121144. Its totient is φ = 194121142.

The previous prime is 194121133. The next prime is 194121149. The reversal of 194121143 is 341121491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194121143 - 2¹⁰ = 194120119 is a prime.

It is equal to p_10771415 and since 194121143 and 10771415 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194121149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97060571 + 97060572.

It is an arithmetic number, because the mean of its divisors is an integer number (97060572).

Almost surely, 2^194121143 is an apocalyptic number.

194121143 is a deficient number, since it is larger than the sum of its proper divisors (1).

194121143 is an equidigital number, since it uses as much as digits as its factorization.

194121143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 194121143 is about 13932.7363787592. The cubic root of 194121143 is about 579.0165090453.

The spelling of 194121143 in words is "one hundred ninety-four million, one hundred twenty-one thousand, one hundred forty-three".