51223410209 has 4 divisors (see below), whose sum is σ = 54236552004. Its totient is φ = 48210268416.

The previous prime is 51223410143. The next prime is 51223410211. The reversal of 51223410209 is 90201432215.

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 35321443600 + 15901966609 = 187940^2 + 126103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51223410209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51223410299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506570872 + ... + 1506570905.

It is an arithmetic number, because the mean of its divisors is an integer number (13559138001).

Almost surely, 2^51223410209 is an apocalyptic number.

It is an amenable number.

51223410209 is a deficient number, since it is larger than the sum of its proper divisors (3013141795).

51223410209 is a wasteful number, since it uses less digits than its factorization.

51223410209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013141794.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 51223410209 in words is "fifty-one billion, two hundred twenty-three million, four hundred ten thousand, two hundred nine".