203643145 has 8 divisors (see below), whose sum is σ = 244971720. Its totient is φ = 162514560.

The previous prime is 203643137. The next prime is 203643157. The reversal of 203643145 is 541346302.

It can be written as a sum of positive squares in 4 ways, for example, as 98724096 + 104919049 = 9936^2 + 10243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 203643145 - 2³ = 203643137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47746 + ... + 51835.

It is an arithmetic number, because the mean of its divisors is an integer number (30621465).

Almost surely, 2^203643145 is an apocalyptic number.

It is an amenable number.

203643145 is a deficient number, since it is larger than the sum of its proper divisors (41328575).

203643145 is an equidigital number, since it uses as much as digits as its factorization.

203643145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99995.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 203643145 is about 14270.3589653519. The cubic root of 203643145 is about 588.3330761733. Note that the first 3 decimals are identical.

Adding to 203643145 its reverse (541346302), we get a palindrome (744989447).

The spelling of 203643145 in words is "two hundred three million, six hundred forty-three thousand, one hundred forty-five".