243203504413 has 4 divisors (see below), whose sum is σ = 243271881180. Its totient is φ = 243135127648.

The previous prime is 243203504371. The next prime is 243203504429. The reversal of 243203504413 is 314405302342.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103553309209 + 139650195204 = 321797^2 + 373698^2 .

It is a cyclic number.

It is not a de Polignac number, because 243203504413 - 2¹⁷ = 243203373341 is a prime.

It is a super-2 number, since 2×243203504413² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243203504813) 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, 34183048 + ... + 34190161.

It is an arithmetic number, because the mean of its divisors is an integer number (60817970295).

Almost surely, 2^243203504413 is an apocalyptic number.

It is an amenable number.

243203504413 is a deficient number, since it is larger than the sum of its proper divisors (68376767).

243203504413 is an equidigital number, since it uses as much as digits as its factorization.

243203504413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68376766.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 243203504413 its reverse (314405302342), we get a palindrome (557608806755).

The spelling of 243203504413 in words is "two hundred forty-three billion, two hundred three million, five hundred four thousand, four hundred thirteen".