213624245 has 4 divisors (see below), whose sum is σ = 256349100. Its totient is φ = 170899392.

The previous prime is 213624223. The next prime is 213624263. The reversal of 213624245 is 542426312.

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 146482609 + 67141636 = 12103^2 + 8194^2 .

It is a cyclic number.

It is not a de Polignac number, because 213624245 - 2¹² = 213620149 is a prime.

It is a Curzon number.

It is a congruent number.

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, 21362420 + ... + 21362429.

It is an arithmetic number, because the mean of its divisors is an integer number (64087275).

Almost surely, 2^213624245 is an apocalyptic number.

It is an amenable number.

213624245 is a deficient number, since it is larger than the sum of its proper divisors (42724855).

213624245 is an equidigital number, since it uses as much as digits as its factorization.

213624245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42724854.

The product of its digits is 11520, while the sum is 29.

The square root of 213624245 is about 14615.8901542123. The cubic root of 213624245 is about 597.7921122033.

The spelling of 213624245 in words is "two hundred thirteen million, six hundred twenty-four thousand, two hundred forty-five".