2001609839 has 2 divisors, whose sum is σ = 2001609840. Its totient is φ = 2001609838.

The previous prime is 2001609811. The next prime is 2001609871. The reversal of 2001609839 is 9389061002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001609839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001609809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000804919 + 1000804920.

It is an arithmetic number, because the mean of its divisors is an integer number (1000804920).

Almost surely, 2^2001609839 is an apocalyptic number.

2001609839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001609839 is an equidigital number, since it uses as much as digits as its factorization.

2001609839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 2001609839 is about 44739.3544767915. The cubic root of 2001609839 is about 1260.2590042429.

The spelling of 2001609839 in words is "two billion, one million, six hundred nine thousand, eight hundred thirty-nine".