2172019 has 4 divisors (see below), whose sum is σ = 2176696. Its totient is φ = 2167344.

The previous prime is 2172007. The next prime is 2172031. The reversal of 2172019 is 9102712.

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

It is an interprime number because it is at equal distance from previous prime (2172007) and next prime (2172031).

It is a cyclic number.

It is not a de Polignac number, because 2172019 - 2¹³ = 2163827 is a prime.

It is a super-2 number, since 2×2172019² = 9435333072722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172089) 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, 1554 + ... + 2599.

It is an arithmetic number, because the mean of its divisors is an integer number (544174).

2^2172019 is an apocalyptic number.

2172019 is a deficient number, since it is larger than the sum of its proper divisors (4677).

2172019 is an equidigital number, since it uses as much as digits as its factorization.

2172019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4676.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2172019 is about 1473.7771201915. Note that the first 3 decimals coincide. The cubic root of 2172019 is about 129.5053987205.

The spelling of 2172019 in words is "two million, one hundred seventy-two thousand, nineteen".