243261 has 12 divisors (see below), whose sum is σ = 355680. Its totient is φ = 160200.

The previous prime is 243259. The next prime is 243263. The reversal of 243261 is 162342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243259) and next prime (243263).

It is not a de Polignac number, because 243261 - 2¹ = 243259 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243261.

It is not an unprimeable number, because it can be changed into a prime (243263) 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, 1270 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (29640).

2²⁴³²⁶¹ is an apocalyptic number.

It is an amenable number.

243261 is a deficient number, since it is larger than the sum of its proper divisors (112419).

243261 is a wasteful number, since it uses less digits than its factorization.

243261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 333 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 243261 is about 493.2149632767. The cubic root of 243261 is about 62.4248483385.

The spelling of 243261 in words is "two hundred forty-three thousand, two hundred sixty-one".