842399191 has 2 divisors, whose sum is σ = 842399192. Its totient is φ = 842399190.

The previous prime is 842399179. The next prime is 842399209. The reversal of 842399191 is 191993248.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842399191 - 2⁹ = 842398679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842399101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421199595 + 421199596.

It is an arithmetic number, because the mean of its divisors is an integer number (421199596).

Almost surely, 2^842399191 is an apocalyptic number.

842399191 is a deficient number, since it is larger than the sum of its proper divisors (1).

842399191 is an equidigital number, since it uses as much as digits as its factorization.

842399191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 842399191 is about 29024.1139571908. The cubic root of 842399191 is about 944.4362476485.

The spelling of 842399191 in words is "eight hundred forty-two million, three hundred ninety-nine thousand, one hundred ninety-one".