243901 has 4 divisors (see below), whose sum is σ = 278752. Its totient is φ = 209052.

The previous prime is 243889. The next prime is 243911. The reversal of 243901 is 109342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243901 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17415 + ... + 17428.

It is an arithmetic number, because the mean of its divisors is an integer number (69688).

2²⁴³⁹⁰¹ is an apocalyptic number.

It is an amenable number.

243901 is a deficient number, since it is larger than the sum of its proper divisors (34851).

243901 is an equidigital number, since it uses as much as digits as its factorization.

243901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34850.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 243901 is about 493.8633414215. The cubic root of 243901 is about 62.4795453064.

The spelling of 243901 in words is "two hundred forty-three thousand, nine hundred one".