243138451 has 6 divisors (see below), whose sum is σ = 254169860. Its totient is φ = 232566708.

The previous prime is 243138443. The next prime is 243138463. The reversal of 243138451 is 154831342.

It is not a de Polignac number, because 243138451 - 2³ = 243138443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243138491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229281 + ... + 230338.

Almost surely, 2^243138451 is an apocalyptic number.

243138451 is a deficient number, since it is larger than the sum of its proper divisors (11031409).

243138451 is an equidigital number, since it uses as much as digits as its factorization.

243138451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459665 (or 459642 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 243138451 is about 15592.8974536486. The cubic root of 243138451 is about 624.1436386884.

Adding to 243138451 its reverse (154831342), we get a palindrome (397969793).

The spelling of 243138451 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred fifty-one".