2191040520 has 64 divisors (see below), whose sum is σ = 6684552000. Its totient is φ = 574372608.

The previous prime is 2191040503. The next prime is 2191040521. The reversal of 2191040520 is 250401912.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2191040521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147655 + ... + 161814.

It is an arithmetic number, because the mean of its divisors is an integer number (104446125).

Almost surely, 2^2191040520 is an apocalyptic number.

2191040520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191040520 is an abundant number, since it is smaller than the sum of its proper divisors (4493511480).

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

2191040520 is a wasteful number, since it uses less digits than its factorization.

2191040520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309542 (or 309538 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 2191040520 is about 46808.5517827672. The cubic root of 2191040520 is about 1298.8234957388.

The spelling of 2191040520 in words is "two billion, one hundred ninety-one million, forty thousand, five hundred twenty".