243402331 has 8 divisors (see below), whose sum is σ = 261665280. Its totient is φ = 225684648.

The previous prime is 243402301. The next prime is 243402347. The reversal of 243402331 is 133204342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243402331 - 2²⁵ = 209847899 is a prime.

It is a super-2 number, since 2×243402331² = 118489389472467122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243402301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135391 + ... + 137176.

It is an arithmetic number, because the mean of its divisors is an integer number (32708160).

Almost surely, 2^243402331 is an apocalyptic number.

243402331 is a deficient number, since it is larger than the sum of its proper divisors (18262949).

243402331 is a wasteful number, since it uses less digits than its factorization.

243402331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272633.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243402331 is about 15601.3567038255. The cubic root of 243402331 is about 624.3693529890.

Adding to 243402331 its reverse (133204342), we get a palindrome (376606673).

The spelling of 243402331 in words is "two hundred forty-three million, four hundred two thousand, three hundred thirty-one".