203431313 has 4 divisors (see below), whose sum is σ = 203499300. Its totient is φ = 203363328.

The previous prime is 203431273. The next prime is 203431357. The reversal of 203431313 is 313134302.

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 166074769 + 37356544 = 12887^2 + 6112^2 .

It is a cyclic number.

It is not a de Polignac number, because 203431313 - 2⁸ = 203431057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203433313) 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, 29288 + ... + 35561.

It is an arithmetic number, because the mean of its divisors is an integer number (50874825).

Almost surely, 2^203431313 is an apocalyptic number.

It is an amenable number.

203431313 is a deficient number, since it is larger than the sum of its proper divisors (67987).

203431313 is an equidigital number, since it uses as much as digits as its factorization.

203431313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67986.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 203431313 is about 14262.9349364007. The cubic root of 203431313 is about 588.1290083986.

Adding to 203431313 its reverse (313134302), we get a palindrome (516565615).

The spelling of 203431313 in words is "two hundred three million, four hundred thirty-one thousand, three hundred thirteen".