2107691 has 4 divisors (see below), whose sum is σ = 2180400. Its totient is φ = 2034984.

The previous prime is 2107669. The next prime is 2107709. The reversal of 2107691 is 1967012.

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

It is a cyclic number.

It is not a de Polignac number, because 2107691 - 2⁶ = 2107627 is a prime.

It is a super-2 number, since 2×2107691² = 8884722702962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2107691.

It is not an unprimeable number, because it can be changed into a prime (2107601) 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, 36311 + ... + 36368.

It is an arithmetic number, because the mean of its divisors is an integer number (545100).

2^2107691 is an apocalyptic number.

2107691 is a deficient number, since it is larger than the sum of its proper divisors (72709).

2107691 is an equidigital number, since it uses as much as digits as its factorization.

2107691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72708.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 2107691 is about 1451.7888964998. The cubic root of 2107691 is about 128.2140583280.

The spelling of 2107691 in words is "two million, one hundred seven thousand, six hundred ninety-one".