243971 has 12 divisors (see below), whose sum is σ = 306432. Its totient is φ = 192528.

The previous prime is 243953. The next prime is 243973. The reversal of 243971 is 179342.

243971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-243971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243971.

It is not an unprimeable number, because it can be changed into a prime (243973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (25536).

2²⁴³⁹⁷¹ is an apocalyptic number.

243971 is a deficient number, since it is larger than the sum of its proper divisors (62461).

243971 is a wasteful number, since it uses less digits than its factorization.

243971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 403 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 243971 is about 493.9342061449. The cubic root of 243971 is about 62.4855219798.

The spelling of 243971 in words is "two hundred forty-three thousand, nine hundred seventy-one".