194993243 has 2 divisors, whose sum is σ = 194993244. Its totient is φ = 194993242.

The previous prime is 194993233. The next prime is 194993297. The reversal of 194993243 is 342399491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194993243 - 2¹⁰ = 194992219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194993194 and 194993203.

It is not a weakly prime, because it can be changed into another prime (194993203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97496621 + 97496622.

It is an arithmetic number, because the mean of its divisors is an integer number (97496622).

Almost surely, 2^194993243 is an apocalyptic number.

194993243 is a deficient number, since it is larger than the sum of its proper divisors (1).

194993243 is an equidigital number, since it uses as much as digits as its factorization.

194993243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 44.

The square root of 194993243 is about 13963.9981022628. The cubic root of 194993243 is about 579.8823017218.

The spelling of 194993243 in words is "one hundred ninety-four million, nine hundred ninety-three thousand, two hundred forty-three".