2091819 has 8 divisors (see below), whose sum is σ = 2815120. Its totient is φ = 1381536.

The previous prime is 2091809. The next prime is 2091839. The reversal of 2091819 is 9181902.

2091819 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2091819 is a prime.

It is a super-2 number, since 2×2091819² = 8751413457522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2872 + ... + 3525.

It is an arithmetic number, because the mean of its divisors is an integer number (351890).

2^2091819 is an apocalyptic number.

2091819 is a deficient number, since it is larger than the sum of its proper divisors (723301).

2091819 is a wasteful number, since it uses less digits than its factorization.

2091819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6509.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2091819 is about 1446.3122069595. The cubic root of 2091819 is about 127.8914077361.

The spelling of 2091819 in words is "two million, ninety-one thousand, eight hundred nineteen".