243401313 has 4 divisors (see below), whose sum is σ = 324535088. Its totient is φ = 162267540.

The previous prime is 243401299. The next prime is 243401363. The reversal of 243401313 is 313104342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243401313 - 2¹⁴ = 243384929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243401313.

It is not an unprimeable number, because it can be changed into a prime (243401363) 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, 40566883 + ... + 40566888.

It is an arithmetic number, because the mean of its divisors is an integer number (81133772).

Almost surely, 2^243401313 is an apocalyptic number.

It is an amenable number.

243401313 is a deficient number, since it is larger than the sum of its proper divisors (81133775).

243401313 is an equidigital number, since it uses as much as digits as its factorization.

243401313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81133774.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 243401313 is about 15601.3240784236. The cubic root of 243401313 is about 624.3684825387.

Adding to 243401313 its reverse (313104342), we get a palindrome (556505655).

The spelling of 243401313 in words is "two hundred forty-three million, four hundred one thousand, three hundred thirteen".