2071691 has 4 divisors (see below), whose sum is σ = 2075712. Its totient is φ = 2067672.

The previous prime is 2071687. The next prime is 2071711. The reversal of 2071691 is 1961702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1961702 = 2 ⋅980851.

It is a cyclic number.

It is not a de Polignac number, because 2071691 - 2² = 2071687 is a prime.

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 2071691.

It is not an unprimeable number, because it can be changed into a prime (2071631) 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, 1100 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (518928).

2^2071691 is an apocalyptic number.

2071691 is a deficient number, since it is larger than the sum of its proper divisors (4021).

2071691 is an equidigital number, since it uses as much as digits as its factorization.

2071691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020.

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

The square root of 2071691 is about 1439.3370001497. The cubic root of 2071691 is about 127.4798840493.

The spelling of 2071691 in words is "two million, seventy-one thousand, six hundred ninety-one".