4422181891 has 4 divisors (see below), whose sum is σ = 4422497752. Its totient is φ = 4421866032.

The previous prime is 4422181859. The next prime is 4422181909. The reversal of 4422181891 is 1981812244.

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

It is a cyclic number.

It is not a de Polignac number, because 4422181891 - 2⁵ = 4422181859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4422181811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135906 + ... + 165271.

It is an arithmetic number, because the mean of its divisors is an integer number (1105624438).

Almost surely, 2^4422181891 is an apocalyptic number.

4422181891 is a deficient number, since it is larger than the sum of its proper divisors (315861).

4422181891 is a wasteful number, since it uses less digits than its factorization.

4422181891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315860.

The product of its digits is 36864, while the sum is 40.

The square root of 4422181891 is about 66499.4879002839. The cubic root of 4422181891 is about 1641.3915775312.

The spelling of 4422181891 in words is "four billion, four hundred twenty-two million, one hundred eighty-one thousand, eight hundred ninety-one".