2643971 has 6 divisors (see below), whose sum is σ = 2906316. Its totient is φ = 2403500.

The previous prime is 2643961. The next prime is 2643989. The reversal of 2643971 is 1793462.

It is a de Polignac number, because none of the positive numbers 2^k-2643971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10805 + ... + 11046.

It is an arithmetic number, because the mean of its divisors is an integer number (484386).

2^2643971 is an apocalyptic number.

2643971 is a deficient number, since it is larger than the sum of its proper divisors (262345).

2643971 is a wasteful number, since it uses less digits than its factorization.

2643971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21873 (or 21862 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 2643971 is about 1626.0292125297. The cubic root of 2643971 is about 138.2777260734.

The spelling of 2643971 in words is "two million, six hundred forty-three thousand, nine hundred seventy-one".