203224145 has 4 divisors (see below), whose sum is σ = 243868980. Its totient is φ = 162579312.

The previous prime is 203224139. The next prime is 203224157. The reversal of 203224145 is 541422302.

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 105431824 + 97792321 = 10268^2 + 9889^2 .

It is a cyclic number.

It is not a de Polignac number, because 203224145 - 2¹² = 203220049 is a prime.

It is a super-2 number, since 2×203224145² = 82600106221962050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 203224145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20322410 + ... + 20322419.

It is an arithmetic number, because the mean of its divisors is an integer number (60967245).

Almost surely, 2^203224145 is an apocalyptic number.

It is an amenable number.

203224145 is a deficient number, since it is larger than the sum of its proper divisors (40644835).

203224145 is an equidigital number, since it uses as much as digits as its factorization.

203224145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40644834.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 203224145 is about 14255.6706261052. The cubic root of 203224145 is about 587.9292966108.

Adding to 203224145 its reverse (541422302), we get a palindrome (744646447).

The spelling of 203224145 in words is "two hundred three million, two hundred twenty-four thousand, one hundred forty-five".