243238031 has 4 divisors (see below), whose sum is σ = 243880200. Its totient is φ = 242595864.

The previous prime is 243238027. The next prime is 243238063. The reversal of 243238031 is 130832342.

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

It is a cyclic number.

It is not a de Polignac number, because 243238031 - 2² = 243238027 is a prime.

It is a super-2 number, since 2×243238031² = 118329479449513922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243238081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320516 + ... + 321273.

It is an arithmetic number, because the mean of its divisors is an integer number (60970050).

Almost surely, 2^243238031 is an apocalyptic number.

243238031 is a deficient number, since it is larger than the sum of its proper divisors (642169).

243238031 is an equidigital number, since it uses as much as digits as its factorization.

243238031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642168.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 243238031 is about 15596.0902472382. The cubic root of 243238031 is about 624.2288353328.

The spelling of 243238031 in words is "two hundred forty-three million, two hundred thirty-eight thousand, thirty-one".