243203413 has 2 divisors, whose sum is σ = 243203414. Its totient is φ = 243203412.

The previous prime is 243203393. The next prime is 243203437. The reversal of 243203413 is 314302342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213685924 + 29517489 = 14618^2 + 5433^2 .

It is a cyclic number.

It is not a de Polignac number, because 243203413 - 2⁵ = 243203381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243203113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601706 + 121601707.

It is an arithmetic number, because the mean of its divisors is an integer number (121601707).

Almost surely, 2^243203413 is an apocalyptic number.

It is an amenable number.

243203413 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203413 is an equidigital number, since it uses as much as digits as its factorization.

243203413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243203413 is about 15594.9803783140. The cubic root of 243203413 is about 624.1992202009.

Adding to 243203413 its reverse (314302342), we get a palindrome (557505755).

The spelling of 243203413 in words is "two hundred forty-three million, two hundred three thousand, four hundred thirteen".