210145 has 16 divisors (see below), whose sum is σ = 281232. Its totient is φ = 149760.

The previous prime is 210143. The next prime is 210157. The reversal of 210145 is 541012.

210145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 40401 + 169744 = 201^2 + 412^2 .

It is not a de Polignac number, because 210145 - 2¹ = 210143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210143) 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, 3415 + ... + 3475.

It is an arithmetic number, because the mean of its divisors is an integer number (17577).

2²¹⁰¹⁴⁵ is an apocalyptic number.

210145 is the 265-th octagonal number.

It is an amenable number.

210145 is a deficient number, since it is larger than the sum of its proper divisors (71087).

210145 is a wasteful number, since it uses less digits than its factorization.

210145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 210145 is about 458.4157501657. The cubic root of 210145 is about 59.4528968355.

Adding to 210145 its reverse (541012), we get a palindrome (751157).

The spelling of 210145 in words is "two hundred ten thousand, one hundred forty-five".