193920971 has 2 divisors, whose sum is σ = 193920972. Its totient is φ = 193920970.

The previous prime is 193920953. The next prime is 193920983. The reversal of 193920971 is 179029391.

It is a strong prime.

It is an emirp because it is prime and its reverse (179029391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193920971 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193920911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96960485 + 96960486.

It is an arithmetic number, because the mean of its divisors is an integer number (96960486).

Almost surely, 2^193920971 is an apocalyptic number.

193920971 is a deficient number, since it is larger than the sum of its proper divisors (1).

193920971 is an equidigital number, since it uses as much as digits as its factorization.

193920971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 193920971 is about 13925.5510124375. The cubic root of 193920971 is about 578.8174190128.

The spelling of 193920971 in words is "one hundred ninety-three million, nine hundred twenty thousand, nine hundred seventy-one".