51211011233 has 4 divisors (see below), whose sum is σ = 51211623060. Its totient is φ = 51210399408.

The previous prime is 51211011197. The next prime is 51211011283. The reversal of 51211011233 is 33211011215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24652768144 + 26558243089 = 157012^2 + 162967^2 .

It is a cyclic number.

It is not a de Polignac number, because 51211011233 - 2¹⁶ = 51210945697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51211011283) 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, 155810 + ... + 355947.

It is an arithmetic number, because the mean of its divisors is an integer number (12802905765).

Almost surely, 2^51211011233 is an apocalyptic number.

It is an amenable number.

51211011233 is a deficient number, since it is larger than the sum of its proper divisors (611827).

51211011233 is a wasteful number, since it uses less digits than its factorization.

51211011233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611826.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 51211011233 its reverse (33211011215), we get a palindrome (84422022448).

The spelling of 51211011233 in words is "fifty-one billion, two hundred eleven million, eleven thousand, two hundred thirty-three".