202145 has 4 divisors (see below), whose sum is σ = 242580. Its totient is φ = 161712.

The previous prime is 202129. The next prime is 202183. The reversal of 202145 is 541202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541202 = 2 ⋅270601.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 71824 = 361^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 202145 - 2⁴ = 202129 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 202145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20210 + ... + 20219.

It is an arithmetic number, because the mean of its divisors is an integer number (60645).

2²⁰²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

202145 is a deficient number, since it is larger than the sum of its proper divisors (40435).

202145 is an equidigital number, since it uses as much as digits as its factorization.

202145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40434.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 202145 is about 449.6053825301. The cubic root of 202145 is about 58.6886790388.

Adding to 202145 its reverse (541202), we get a palindrome (743347).

The spelling of 202145 in words is "two hundred two thousand, one hundred forty-five".