192991 has 2 divisors, whose sum is σ = 192992. Its totient is φ = 192990.

The previous prime is 192979. The next prime is 193003. The reversal of 192991 is 199291.

It is a balanced prime because it is at equal distance from previous prime (192979) and next prime (193003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (192931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96495 + 96496.

It is an arithmetic number, because the mean of its divisors is an integer number (96496).

2¹⁹²⁹⁹¹ is an apocalyptic number.

192991 is a deficient number, since it is larger than the sum of its proper divisors (1).

192991 is an equidigital number, since it uses as much as digits as its factorization.

192991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 31.

The square root of 192991 is about 439.3074094527. The cubic root of 192991 is about 57.7890673479.

The spelling of 192991 in words is "one hundred ninety-two thousand, nine hundred ninety-one".