243431413 has 2 divisors, whose sum is σ = 243431414. Its totient is φ = 243431412.

The previous prime is 243431407. The next prime is 243431429. The reversal of 243431413 is 314134342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130370724 + 113060689 = 11418^2 + 10633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243431413 is a prime.

It is equal to p_13339213 and since 243431413 and 13339213 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243431443) 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 as a sum of consecutive naturals, namely, 121715706 + 121715707.

It is an arithmetic number, because the mean of its divisors is an integer number (121715707).

Almost surely, 2^243431413 is an apocalyptic number.

It is an amenable number.

243431413 is a deficient number, since it is larger than the sum of its proper divisors (1).

243431413 is an equidigital number, since it uses as much as digits as its factorization.

243431413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 25.

The square root of 243431413 is about 15602.2887103143. The cubic root of 243431413 is about 624.3942187963.

Adding to 243431413 its reverse (314134342), we get a palindrome (557565755).

The spelling of 243431413 in words is "two hundred forty-three million, four hundred thirty-one thousand, four hundred thirteen".