2191883864 has 8 divisors (see below), whose sum is σ = 4109782260. Its totient is φ = 1095941928.

The previous prime is 2191883857. The next prime is 2191883879. The reversal of 2191883864 is 4683881912.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136992734 + ... + 136992749.

Almost surely, 2^2191883864 is an apocalyptic number.

It is an amenable number.

2191883864 is a deficient number, since it is larger than the sum of its proper divisors (1917898396).

2191883864 is a wasteful number, since it uses less digits than its factorization.

2191883864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273985489 (or 273985485 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 2191883864 is about 46817.5593554384. The cubic root of 2191883864 is about 1298.9901158881.

The spelling of 2191883864 in words is "two billion, one hundred ninety-one million, eight hundred eighty-three thousand, eight hundred sixty-four".