2163591867 has 4 divisors (see below), whose sum is σ = 2884789160. Its totient is φ = 1442394576.

The previous prime is 2163591863. The next prime is 2163591889. The reversal of 2163591867 is 7681953612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2163591867 - 2² = 2163591863 is a prime.

It is a super-2 number, since 2×2163591867² = 9362259533897091378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163591863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360598642 + ... + 360598647.

It is an arithmetic number, because the mean of its divisors is an integer number (721197290).

Almost surely, 2^2163591867 is an apocalyptic number.

2163591867 is a deficient number, since it is larger than the sum of its proper divisors (721197293).

2163591867 is an equidigital number, since it uses as much as digits as its factorization.

2163591867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721197292.

The product of its digits is 544320, while the sum is 48.

The square root of 2163591867 is about 46514.4264395467. The cubic root of 2163591867 is about 1293.3769397046.

The spelling of 2163591867 in words is "two billion, one hundred sixty-three million, five hundred ninety-one thousand, eight hundred sixty-seven".