2002691 has 4 divisors (see below), whose sum is σ = 2035584. Its totient is φ = 1969800.

The previous prime is 2002681. The next prime is 2002723. The reversal of 2002691 is 1962002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16355 + ... + 16476.

It is an arithmetic number, because the mean of its divisors is an integer number (508896).

2^2002691 is an apocalyptic number.

2002691 is a deficient number, since it is larger than the sum of its proper divisors (32893).

2002691 is an equidigital number, since it uses as much as digits as its factorization.

2002691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32892.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2002691 is about 1415.1646547310. The cubic root of 2002691 is about 126.0485871239.

Adding to 2002691 its reverse (1962002), we get a palindrome (3964693).

The spelling of 2002691 in words is "two million, two thousand, six hundred ninety-one".