203530213 has 4 divisors (see below), whose sum is σ = 203921388. Its totient is φ = 203139040.

The previous prime is 203530183. The next prime is 203530231. The reversal of 203530213 is 312035302.

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 119202724 + 84327489 = 10918^2 + 9183^2 .

It is a cyclic number.

It is not a de Polignac number, because 203530213 - 2⁵ = 203530181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203530913) 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, 194806 + ... + 195847.

It is an arithmetic number, because the mean of its divisors is an integer number (50980347).

Almost surely, 2^203530213 is an apocalyptic number.

It is an amenable number.

203530213 is a deficient number, since it is larger than the sum of its proper divisors (391175).

203530213 is an equidigital number, since it uses as much as digits as its factorization.

203530213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391174.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 203530213 is about 14266.4015434867. The cubic root of 203530213 is about 588.2243010630.

Adding to 203530213 its reverse (312035302), we get a palindrome (515565515).

The spelling of 203530213 in words is "two hundred three million, five hundred thirty thousand, two hundred thirteen".