2143971 has 12 divisors (see below), whose sum is σ = 3114280. Its totient is φ = 1421280.

The previous prime is 2143969. The next prime is 2143993. The reversal of 2143971 is 1793412.

2143971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2143971 - 2¹ = 2143969 is a prime.

It is a super-2 number, since 2×2143971² = 9193223297682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143901) 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 11 ways as a sum of consecutive naturals, for example, 1335 + ... + 2463.

2^2143971 is an apocalyptic number.

2143971 is a deficient number, since it is larger than the sum of its proper divisors (970309).

2143971 is a wasteful number, since it uses less digits than its factorization.

2143971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346 (or 1343 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 2143971 is about 1464.2305146390. The cubic root of 2143971 is about 128.9455331625.

The spelling of 2143971 in words is "two million, one hundred forty-three thousand, nine hundred seventy-one".