212545 has 4 divisors (see below), whose sum is σ = 255060. Its totient is φ = 170032.

The previous prime is 212507. The next prime is 212557. The reversal of 212545 is 545212.

212545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 150544 + 62001 = 388^2 + 249^2 .

It is a cyclic number.

It is not a de Polignac number, because 212545 - 2¹³ = 204353 is a prime.

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

212545 is a lucky number.

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, 21250 + ... + 21259.

It is an arithmetic number, because the mean of its divisors is an integer number (63765).

2²¹²⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

212545 is a deficient number, since it is larger than the sum of its proper divisors (42515).

212545 is an equidigital number, since it uses as much as digits as its factorization.

212545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42514.

The product of its digits is 400, while the sum is 19.

The square root of 212545 is about 461.0260296339. The cubic root of 212545 is about 59.6783715927.

Adding to 212545 its reverse (545212), we get a palindrome (757757).

It can be divided in two parts, 212 and 545, that added together give a palindrome (757).

The spelling of 212545 in words is "two hundred twelve thousand, five hundred forty-five".