2143691 has 8 divisors (see below), whose sum is σ = 2383344. Its totient is φ = 1911520.

The previous prime is 2143667. The next prime is 2143711. The reversal of 2143691 is 1963412.

2143691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2143691 - 2⁶ = 2143627 is a prime.

It is a super-2 number, since 2×2143691² = 9190822206962, 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 2143691.

It is not an unprimeable number, because it can be changed into a prime (2143621) 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 7 ways as a sum of consecutive naturals, for example, 1256 + ... + 2421.

It is an arithmetic number, because the mean of its divisors is an integer number (297918).

2^2143691 is an apocalyptic number.

2143691 is a deficient number, since it is larger than the sum of its proper divisors (239653).

2143691 is a wasteful number, since it uses less digits than its factorization.

2143691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741.

The product of its digits is 1296, while the sum is 26.

The square root of 2143691 is about 1464.1348981566. The cubic root of 2143691 is about 128.9399195417.

The spelling of 2143691 in words is "two million, one hundred forty-three thousand, six hundred ninety-one".