243307231 has 4 divisors (see below), whose sum is σ = 243388600. Its totient is φ = 243225864.

The previous prime is 243307171. The next prime is 243307249. The reversal of 243307231 is 132703342.

243307231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243307231 is a prime.

It is a super-2 number, since 2×243307231² = 118396817313774722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243307196 and 243307205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243307291) 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, 36021 + ... + 42238.

It is an arithmetic number, because the mean of its divisors is an integer number (60847150).

Almost surely, 2^243307231 is an apocalyptic number.

243307231 is a deficient number, since it is larger than the sum of its proper divisors (81369).

243307231 is an equidigital number, since it uses as much as digits as its factorization.

243307231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81368.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 243307231 is about 15598.3085942034. The cubic root of 243307231 is about 624.2880263777.

The spelling of 243307231 in words is "two hundred forty-three million, three hundred seven thousand, two hundred thirty-one".