192937991 has 2 divisors, whose sum is σ = 192937992. Its totient is φ = 192937990.

The previous prime is 192937933. The next prime is 192937993. The reversal of 192937991 is 199739291.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192937991 is a prime.

It is a super-2 number, since 2×192937991² = 74450136742232162, which contains 22 as substring.

Together with 192937993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (192937993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96468995 + 96468996.

It is an arithmetic number, because the mean of its divisors is an integer number (96468996).

Almost surely, 2^192937991 is an apocalyptic number.

192937991 is a deficient number, since it is larger than the sum of its proper divisors (1).

192937991 is an equidigital number, since it uses as much as digits as its factorization.

192937991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 50.

The square root of 192937991 is about 13890.2120574165. The cubic root of 192937991 is about 577.8377587289.

The spelling of 192937991 in words is "one hundred ninety-two million, nine hundred thirty-seven thousand, nine hundred ninety-one".