2191543744 has 56 divisors (see below), whose sum is σ = 4810016288. Its totient is φ = 984130560.

The previous prime is 2191543691. The next prime is 2191543747. The reversal of 2191543744 is 4473451912.

It is a junction number, because it is equal to n+sod(n) for n = 2191543697 and 2191543706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191543747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4812 + ... + 66379.

It is an arithmetic number, because the mean of its divisors is an integer number (85893148).

Almost surely, 2^2191543744 is an apocalyptic number.

It is an amenable number.

2191543744 is an abundant number, since it is smaller than the sum of its proper divisors (2618472544).

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

2191543744 is a wasteful number, since it uses less digits than its factorization.

2191543744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71253 (or 71243 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 2191543744 is about 46813.9268167070. The cubic root of 2191543744 is about 1298.9229232508.

The spelling of 2191543744 in words is "two billion, one hundred ninety-one million, five hundred forty-three thousand, seven hundred forty-four".