213602645 has 4 divisors (see below), whose sum is σ = 256323180. Its totient is φ = 170882112.

The previous prime is 213602621. The next prime is 213602647. The reversal of 213602645 is 546206312.

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 121308196 + 92294449 = 11014^2 + 9607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213602645 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213602647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21360260 + ... + 21360269.

It is an arithmetic number, because the mean of its divisors is an integer number (64080795).

Almost surely, 2^213602645 is an apocalyptic number.

It is an amenable number.

213602645 is a deficient number, since it is larger than the sum of its proper divisors (42720535).

213602645 is an equidigital number, since it uses as much as digits as its factorization.

213602645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42720534.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 213602645 is about 14615.1512137234. The cubic root of 213602645 is about 597.7719635152.

Adding to 213602645 its reverse (546206312), we get a palindrome (759808957).

The spelling of 213602645 in words is "two hundred thirteen million, six hundred two thousand, six hundred forty-five".