51121234013 has 8 divisors (see below), whose sum is σ = 51591412728. Its totient is φ = 50651367424.

The previous prime is 51121233913. The next prime is 51121234033. The reversal of 51121234013 is 31043212115.

It can be written as a sum of positive squares in 4 ways, for example, as 2261668249 + 48859565764 = 47557^2 + 221042^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51121234013 - 2²⁶ = 51054125149 is a prime.

It is a super-2 number, since 2×51121234013² (a number of 22 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 51121234013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121234033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257645 + ... + 410637.

It is an arithmetic number, because the mean of its divisors is an integer number (6448926591).

Almost surely, 2^51121234013 is an apocalyptic number.

It is an amenable number.

51121234013 is a deficient number, since it is larger than the sum of its proper divisors (470178715).

51121234013 is a wasteful number, since it uses less digits than its factorization.

51121234013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156063.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 51121234013 its reverse (31043212115), we get a palindrome (82164446128).

The spelling of 51121234013 in words is "fifty-one billion, one hundred twenty-one million, two hundred thirty-four thousand, thirteen".