194979143 has 2 divisors, whose sum is σ = 194979144. Its totient is φ = 194979142.

The previous prime is 194979089. The next prime is 194979167. The reversal of 194979143 is 341979491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194979143 - 2⁶ = 194979079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194979193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97489571 + 97489572.

It is an arithmetic number, because the mean of its divisors is an integer number (97489572).

Almost surely, 2^194979143 is an apocalyptic number.

194979143 is a deficient number, since it is larger than the sum of its proper divisors (1).

194979143 is an equidigital number, since it uses as much as digits as its factorization.

194979143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 194979143 is about 13963.4932234022. The cubic root of 194979143 is about 579.8683242502.

The spelling of 194979143 in words is "one hundred ninety-four million, nine hundred seventy-nine thousand, one hundred forty-three".