192871391 has 2 divisors, whose sum is σ = 192871392. Its totient is φ = 192871390.

The previous prime is 192871387. The next prime is 192871423. The reversal of 192871391 is 193178291.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 192871391 - 2² = 192871387 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (192871321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96435695 + 96435696.

It is an arithmetic number, because the mean of its divisors is an integer number (96435696).

Almost surely, 2^192871391 is an apocalyptic number.

192871391 is a deficient number, since it is larger than the sum of its proper divisors (1).

192871391 is an equidigital number, since it uses as much as digits as its factorization.

192871391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 192871391 is about 13887.8144788876. The cubic root of 192871391 is about 577.7712634032.

The spelling of 192871391 in words is "one hundred ninety-two million, eight hundred seventy-one thousand, three hundred ninety-one".