243813431 has 2 divisors, whose sum is σ = 243813432. Its totient is φ = 243813430.

The previous prime is 243813421. The next prime is 243813497. The reversal of 243813431 is 134318342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243813431 is a prime.

It is a super-2 number, since 2×243813431² = 118889978271983522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243813394 and 243813403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243813421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121906715 + 121906716.

It is an arithmetic number, because the mean of its divisors is an integer number (121906716).

Almost surely, 2^243813431 is an apocalyptic number.

243813431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243813431 is an equidigital number, since it uses as much as digits as its factorization.

243813431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 243813431 is about 15614.5262816392. The cubic root of 243813431 is about 624.7206696312.

The spelling of 243813431 in words is "two hundred forty-three million, eight hundred thirteen thousand, four hundred thirty-one".