243242031 has 4 divisors (see below), whose sum is σ = 324322712. Its totient is φ = 162161352.

The previous prime is 243242017. The next prime is 243242039. The reversal of 243242031 is 130242342.

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

It is not a de Polignac number, because 243242031 - 2¹⁸ = 242979887 is a prime.

It is a super-2 number, since 2×243242031² = 118333371290009922, 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 = 243241989 and 243242007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243242039) 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, 40540336 + ... + 40540341.

It is an arithmetic number, because the mean of its divisors is an integer number (81080678).

Almost surely, 2^243242031 is an apocalyptic number.

243242031 is a deficient number, since it is larger than the sum of its proper divisors (81080681).

243242031 is an equidigital number, since it uses as much as digits as its factorization.

243242031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81080680.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243242031 is about 15596.2184839787. The cubic root of 243242031 is about 624.2322570861.

Adding to 243242031 its reverse (130242342), we get a palindrome (373484373).

The spelling of 243242031 in words is "two hundred forty-three million, two hundred forty-two thousand, thirty-one".