2081699 has 4 divisors (see below), whose sum is σ = 2092464. Its totient is φ = 2070936.

The previous prime is 2081687. The next prime is 2081719. The reversal of 2081699 is 9961802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9961802 = 2 ⋅4980901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5087 + ... + 5480.

It is an arithmetic number, because the mean of its divisors is an integer number (523116).

2^2081699 is an apocalyptic number.

2081699 is a deficient number, since it is larger than the sum of its proper divisors (10765).

2081699 is a wasteful number, since it uses less digits than its factorization.

2081699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10764.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2081699 is about 1442.8094122232. The cubic root of 2081699 is about 127.6848325273.

The spelling of 2081699 in words is "two million, eighty-one thousand, six hundred ninety-nine".