551243230213 has 4 divisors (see below), whose sum is σ = 593646555628. Its totient is φ = 508839904800.

The previous prime is 551243230211. The next prime is 551243230243. The reversal of 551243230213 is 312032342155.

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 47566301409 + 503676928804 = 218097^2 + 709702^2 .

It is a cyclic number.

It is not a de Polignac number, because 551243230213 - 2¹ = 551243230211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551243230211) 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, 21201662688 + ... + 21201662713.

It is an arithmetic number, because the mean of its divisors is an integer number (148411638907).

Almost surely, 2^551243230213 is an apocalyptic number.

It is an amenable number.

551243230213 is a deficient number, since it is larger than the sum of its proper divisors (42403325415).

551243230213 is a wasteful number, since it uses less digits than its factorization.

551243230213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42403325414.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 551243230213 its reverse (312032342155), we get a palindrome (863275572368).

It can be divided in two parts, 551243 and 230213, that added together give a square (781456 = 884²).

The spelling of 551243230213 in words is "five hundred fifty-one billion, two hundred forty-three million, two hundred thirty thousand, two hundred thirteen".