2191294648 has 16 divisors (see below), whose sum is σ = 4110626880. Its totient is φ = 1095127488.

The previous prime is 2191294621. The next prime is 2191294657. The reversal of 2191294648 is 8464921912.

It is a junction number, because it is equal to n+sod(n) for n = 2191294598 and 2191294607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46765 + ... + 81052.

It is an arithmetic number, because the mean of its divisors is an integer number (256914180).

Almost surely, 2^2191294648 is an apocalyptic number.

It is an amenable number.

2191294648 is a deficient number, since it is larger than the sum of its proper divisors (1919332232).

2191294648 is a wasteful number, since it uses less digits than its factorization.

2191294648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129966 (or 129962 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 2191294648 is about 46811.2662507649. The cubic root of 2191294648 is about 1298.8737085112.

The spelling of 2191294648 in words is "two billion, one hundred ninety-one million, two hundred ninety-four thousand, six hundred forty-eight".