2172622189 has 4 divisors (see below), whose sum is σ = 2176594624. Its totient is φ = 2168649756.

The previous prime is 2172622181. The next prime is 2172622229. The reversal of 2172622189 is 9812262712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2172622189 - 2³ = 2172622181 is a prime.

It is a super-4 number, since 4×2172622189⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172622181) 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, 1985397 + ... + 1986490.

It is an arithmetic number, because the mean of its divisors is an integer number (544148656).

Almost surely, 2^2172622189 is an apocalyptic number.

It is an amenable number.

2172622189 is a deficient number, since it is larger than the sum of its proper divisors (3972435).

2172622189 is an equidigital number, since it uses as much as digits as its factorization.

2172622189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972434.

The product of its digits is 48384, while the sum is 40.

The square root of 2172622189 is about 46611.3954843663. The cubic root of 2172622189 is about 1295.1738587803.

The spelling of 2172622189 in words is "two billion, one hundred seventy-two million, six hundred twenty-two thousand, one hundred eighty-nine".