243420031 has 4 divisors (see below), whose sum is σ = 244015600. Its totient is φ = 242824464.

The previous prime is 243419989. The next prime is 243420041. The reversal of 243420031 is 130024342.

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-243420031 is a prime.

It is a super-2 number, since 2×243420031² = 118506622984081922, 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 = 243419990 and 243420008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243420041) 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, 297171 + ... + 297988.

It is an arithmetic number, because the mean of its divisors is an integer number (61003900).

Almost surely, 2^243420031 is an apocalyptic number.

243420031 is a deficient number, since it is larger than the sum of its proper divisors (595569).

243420031 is an equidigital number, since it uses as much as digits as its factorization.

243420031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595568.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 243420031 is about 15601.9239518721. The cubic root of 243420031 is about 624.3844871493.

Adding to 243420031 its reverse (130024342), we get a palindrome (373444373).

The spelling of 243420031 in words is "two hundred forty-three million, four hundred twenty thousand, thirty-one".