193192991 has 2 divisors, whose sum is σ = 193192992. Its totient is φ = 193192990.

The previous prime is 193192973. The next prime is 193192997. The reversal of 193192991 is 199291391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 193192991 - 2¹⁸ = 192930847 is a prime.

It is a Sophie Germain 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 (193192997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96596495 + 96596496.

It is an arithmetic number, because the mean of its divisors is an integer number (96596496).

Almost surely, 2^193192991 is an apocalyptic number.

193192991 is a deficient number, since it is larger than the sum of its proper divisors (1).

193192991 is an equidigital number, since it uses as much as digits as its factorization.

193192991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 44.

The square root of 193192991 is about 13899.3881520015. The cubic root of 193192991 is about 578.0922165817.

The spelling of 193192991 in words is "one hundred ninety-three million, one hundred ninety-two thousand, nine hundred ninety-one".