51210244052031 has 4 divisors (see below), whose sum is σ = 68280325402712. Its totient is φ = 34140162701352.

The previous prime is 51210244052029. The next prime is 51210244052069. The reversal of 51210244052031 is 13025044201215.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51210244052031 - 2¹ = 51210244052029 is a prime.

It is a super-2 number, since 2×51210244052031² (a number of 28 digits) contains 22 as substring.

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 51210244052031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51210244052531) 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, 8535040675336 + ... + 8535040675341.

It is an arithmetic number, because the mean of its divisors is an integer number (17070081350678).

Almost surely, 2^{51210244052031} is an apocalyptic number.

51210244052031 is a deficient number, since it is larger than the sum of its proper divisors (17070081350681).

51210244052031 is a wasteful number, since it uses less digits than its factorization.

51210244052031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17070081350680.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 51210244052031 its reverse (13025044201215), we get a palindrome (64235288253246).

The spelling of 51210244052031 in words is "fifty-one trillion, two hundred ten billion, two hundred forty-four million, fifty-two thousand, thirty-one".