2191841639 has 16 divisors (see below), whose sum is σ = 2470938624. Its totient is φ = 1930370400.

The previous prime is 2191841629. The next prime is 2191841683. The reversal of 2191841639 is 9361481912.

It is a cyclic number.

It is not a de Polignac number, because 2191841639 - 2²⁸ = 1923406183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191841639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191841609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9689 + ... + 66914.

It is an arithmetic number, because the mean of its divisors is an integer number (154433664).

Almost surely, 2^2191841639 is an apocalyptic number.

2191841639 is a deficient number, since it is larger than the sum of its proper divisors (279096985).

2191841639 is a wasteful number, since it uses less digits than its factorization.

2191841639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76718.

The product of its digits is 93312, while the sum is 44.

The square root of 2191841639 is about 46817.1084006691. The cubic root of 2191841639 is about 1298.9817744775.

The spelling of 2191841639 in words is "two billion, one hundred ninety-one million, eight hundred forty-one thousand, six hundred thirty-nine".