2191481328 has 20 divisors (see below), whose sum is σ = 5661326888. Its totient is φ = 730493760.

The previous prime is 2191481321. The next prime is 2191481363. The reversal of 2191481328 is 8231841912.

2191481328 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191481321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22827883 + ... + 22827978.

Almost surely, 2^2191481328 is an apocalyptic number.

It is an amenable number.

2191481328 is an abundant number, since it is smaller than the sum of its proper divisors (3469845560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191481328 is a wasteful number, since it uses less digits than its factorization.

2191481328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45655872 (or 45655866 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 2191481328 is about 46813.2601727331. The cubic root of 2191481328 is about 1298.9105918607.

The spelling of 2191481328 in words is "two billion, one hundred ninety-one million, four hundred eighty-one thousand, three hundred twenty-eight".