2191856472 has 48 divisors (see below), whose sum is σ = 6392917440. Its totient is φ = 674417088.

The previous prime is 2191856441. The next prime is 2191856483. The reversal of 2191856472 is 2746581912.

2191856472 is a `hidden beast` number, since 2 + 1 + 9 + 18 + 564 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1169928 + ... + 1171799.

It is an arithmetic number, because the mean of its divisors is an integer number (133185780).

Almost surely, 2^2191856472 is an apocalyptic number.

It is an amenable number.

2191856472 is an abundant number, since it is smaller than the sum of its proper divisors (4201060968).

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

2191856472 is a wasteful number, since it uses less digits than its factorization.

2191856472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341752 (or 2341745 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 2191856472 is about 46817.2668147127. The cubic root of 2191856472 is about 1298.9847047004.

The spelling of 2191856472 in words is "two billion, one hundred ninety-one million, eight hundred fifty-six thousand, four hundred seventy-two".