203145 has 16 divisors (see below), whose sum is σ = 336960. Its totient is φ = 104384.

The previous prime is 203141. The next prime is 203173. The reversal of 203145 is 541302.

203145 = 138² + 139² + ... + 147².

It is a cyclic number.

It is not a de Polignac number, because 203145 - 2² = 203141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

203145 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 203145.

It is not an unprimeable number, because it can be changed into a prime (203141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2²⁰³¹⁴⁵ is an apocalyptic number.

It is an amenable number.

203145 is a deficient number, since it is larger than the sum of its proper divisors (133815).

203145 is a wasteful number, since it uses less digits than its factorization.

203145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 203145 is about 450.7160968947. The cubic root of 203145 is about 58.7852964300.

Adding to 203145 its reverse (541302), we get a palindrome (744447).

The spelling of 203145 in words is "two hundred three thousand, one hundred forty-five".