6551243213 has 4 divisors (see below), whose sum is σ = 6557949660. Its totient is φ = 6544536768.

The previous prime is 6551243207. The next prime is 6551243227. The reversal of 6551243213 is 3123421556.

It is a happy number.

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 3796777924 + 2754465289 = 61618^2 + 52483^2 .

It is a cyclic number.

It is not a de Polignac number, because 6551243213 - 2¹⁰ = 6551242189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6551243213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6551245213) 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, 3351758 + ... + 3353711.

It is an arithmetic number, because the mean of its divisors is an integer number (1639487415).

Almost surely, 2^6551243213 is an apocalyptic number.

It is an amenable number.

6551243213 is a deficient number, since it is larger than the sum of its proper divisors (6706447).

6551243213 is an equidigital number, since it uses as much as digits as its factorization.

6551243213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6706446.

The product of its digits is 21600, while the sum is 32.

The square root of 6551243213 is about 80939.7505123410. The cubic root of 6551243213 is about 1871.1469998119.

Adding to 6551243213 its reverse (3123421556), we get a palindrome (9674664769).

The spelling of 6551243213 in words is "six billion, five hundred fifty-one million, two hundred forty-three thousand, two hundred thirteen".