193813901 has 2 divisors, whose sum is σ = 193813902. Its totient is φ = 193813900.

The previous prime is 193813843. The next prime is 193813909. The reversal of 193813901 is 109318391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190302025 + 3511876 = 13795^2 + 1874^2 .

It is a cyclic number.

It is not a de Polignac number, because 193813901 - 2²² = 189619597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193813909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96906950 + 96906951.

It is an arithmetic number, because the mean of its divisors is an integer number (96906951).

Almost surely, 2^193813901 is an apocalyptic number.

It is an amenable number.

193813901 is a deficient number, since it is larger than the sum of its proper divisors (1).

193813901 is an equidigital number, since it uses as much as digits as its factorization.

193813901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 193813901 is about 13921.7061095255. The cubic root of 193813901 is about 578.7108715016.

The spelling of 193813901 in words is "one hundred ninety-three million, eight hundred thirteen thousand, nine hundred one".