2681999 has 4 divisors (see below), whose sum is σ = 2685864. Its totient is φ = 2678136.

The previous prime is 2681993. The next prime is 2682011. The reversal of 2681999 is 9991862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9991862 = 2 ⋅4995931.

It is a cyclic number.

It is not a de Polignac number, because 2681999 - 2¹² = 2677903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681993) 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, 572 + ... + 2385.

It is an arithmetic number, because the mean of its divisors is an integer number (671466).

2^2681999 is an apocalyptic number.

2681999 is a deficient number, since it is larger than the sum of its proper divisors (3865).

2681999 is an equidigital number, since it uses as much as digits as its factorization.

2681999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864.

The product of its digits is 69984, while the sum is 44.

The square root of 2681999 is about 1637.6809823650. The cubic root of 2681999 is about 138.9375182839.

The spelling of 2681999 in words is "two million, six hundred eighty-one thousand, nine hundred ninety-nine".