2102691 has 4 divisors (see below), whose sum is σ = 2803592. Its totient is φ = 1401792.

The previous prime is 2102687. The next prime is 2102693. The reversal of 2102691 is 1962012.

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

It is not a de Polignac number, because 2102691 - 2² = 2102687 is a prime.

It is a D-number.

It is a Duffinian number.

2102691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2102693) 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, 350446 + ... + 350451.

It is an arithmetic number, because the mean of its divisors is an integer number (700898).

2^2102691 is an apocalyptic number.

2102691 is a deficient number, since it is larger than the sum of its proper divisors (700901).

2102691 is an equidigital number, since it uses as much as digits as its factorization.

2102691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700900.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2102691 is about 1450.0658605732. The cubic root of 2102691 is about 128.1125921754.

The spelling of 2102691 in words is "two million, one hundred two thousand, six hundred ninety-one".