840839147191 has 2 divisors, whose sum is σ = 840839147192. Its totient is φ = 840839147190.

The previous prime is 840839147177. The next prime is 840839147207. The reversal of 840839147191 is 191741938048.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840839147191 - 2¹³ = 840839138999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840839247191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420419573595 + 420419573596.

It is an arithmetic number, because the mean of its divisors is an integer number (420419573596).

Almost surely, 2^840839147191 is an apocalyptic number.

840839147191 is a deficient number, since it is larger than the sum of its proper divisors (1).

840839147191 is an equidigital number, since it uses as much as digits as its factorization.

840839147191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 840839147191 in words is "eight hundred forty billion, eight hundred thirty-nine million, one hundred forty-seven thousand, one hundred ninety-one".