213245545 has 4 divisors (see below), whose sum is σ = 255894660. Its totient is φ = 170596432.

The previous prime is 213245519. The next prime is 213245587. The reversal of 213245545 is 545542312.

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 154554624 + 58690921 = 12432^2 + 7661^2 .

It is a cyclic number.

It is not a de Polignac number, because 213245545 - 2²³ = 204856937 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21324550 + ... + 21324559.

It is an arithmetic number, because the mean of its divisors is an integer number (63973665).

Almost surely, 2^213245545 is an apocalyptic number.

It is an amenable number.

213245545 is a deficient number, since it is larger than the sum of its proper divisors (42649115).

213245545 is an equidigital number, since it uses as much as digits as its factorization.

213245545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42649114.

The product of its digits is 24000, while the sum is 31.

The square root of 213245545 is about 14602.9293294188. The cubic root of 213245545 is about 597.4386601596.

Adding to 213245545 its reverse (545542312), we get a palindrome (758787857).

The spelling of 213245545 in words is "two hundred thirteen million, two hundred forty-five thousand, five hundred forty-five".