2191727873 has 16 divisors (see below), whose sum is σ = 2340503424. Its totient is φ = 2045226240.

The previous prime is 2191727851. The next prime is 2191727887. The reversal of 2191727873 is 3787271912.

It is a cyclic number.

It is not a de Polignac number, because 2191727873 - 2¹⁶ = 2191662337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2191727173) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1535186 + ... + 1536612.

It is an arithmetic number, because the mean of its divisors is an integer number (146281464).

Almost surely, 2^2191727873 is an apocalyptic number.

It is an amenable number.

2191727873 is a deficient number, since it is larger than the sum of its proper divisors (148775551).

2191727873 is a wasteful number, since it uses less digits than its factorization.

2191727873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152.

The product of its digits is 296352, while the sum is 47.

The square root of 2191727873 is about 46815.8933803468. The cubic root of 2191727873 is about 1298.9592998433.

The spelling of 2191727873 in words is "two billion, one hundred ninety-one million, seven hundred twenty-seven thousand, eight hundred seventy-three".