51212113251 has 8 divisors (see below), whose sum is σ = 73535342160. Its totient is φ = 31515146592.

The previous prime is 51212113223. The next prime is 51212113291. The reversal of 51212113251 is 15231121215.

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

It is not a de Polignac number, because 51212113251 - 2⁵ = 51212113219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51212113291) 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, 656565516 + ... + 656565593.

It is an arithmetic number, because the mean of its divisors is an integer number (9191917770).

Almost surely, 2^51212113251 is an apocalyptic number.

51212113251 is a deficient number, since it is larger than the sum of its proper divisors (22323228909).

51212113251 is a wasteful number, since it uses less digits than its factorization.

51212113251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313131125.

The product of its digits is 600, while the sum is 24.

Adding to 51212113251 its reverse (15231121215), we get a palindrome (66443234466).

The spelling of 51212113251 in words is "fifty-one billion, two hundred twelve million, one hundred thirteen thousand, two hundred fifty-one".