16840347971 has 2 divisors, whose sum is σ = 16840347972. Its totient is φ = 16840347970.

The previous prime is 16840347947. The next prime is 16840348003. The reversal of 16840347971 is 17974304861.

It is a weak prime.

It is an emirp because it is prime and its reverse (17974304861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16840347971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16840347911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420173985 + 8420173986.

It is an arithmetic number, because the mean of its divisors is an integer number (8420173986).

Almost surely, 2^16840347971 is an apocalyptic number.

16840347971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840347971 is an equidigital number, since it uses as much as digits as its factorization.

16840347971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 16840347971 in words is "sixteen billion, eight hundred forty million, three hundred forty-seven thousand, nine hundred seventy-one".