243849031 has 2 divisors, whose sum is σ = 243849032. Its totient is φ = 243849030.

The previous prime is 243849029. The next prime is 243849043. The reversal of 243849031 is 130948342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243849031 - 2¹ = 243849029 is a prime.

It is a super-2 number, since 2×243849031² = 118924699839277922, which contains 22 as substring.

Together with 243849029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243849631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121924515 + 121924516.

It is an arithmetic number, because the mean of its divisors is an integer number (121924516).

Almost surely, 2^243849031 is an apocalyptic number.

243849031 is a deficient number, since it is larger than the sum of its proper divisors (1).

243849031 is an equidigital number, since it uses as much as digits as its factorization.

243849031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 243849031 is about 15615.6662041682. Note that the first 3 decimals coincide. The cubic root of 243849031 is about 624.7510739905.

The spelling of 243849031 in words is "two hundred forty-three million, eight hundred forty-nine thousand, thirty-one".