51251353251 has 8 divisors (see below), whose sum is σ = 78097300224. Its totient is φ = 29286487560.

The previous prime is 51251353243. The next prime is 51251353267. The reversal of 51251353251 is 15235315215.

It is a happy number.

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

It is not a de Polignac number, because 51251353251 - 2³ = 51251353243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51251353271) 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, 1220270295 + ... + 1220270336.

It is an arithmetic number, because the mean of its divisors is an integer number (9762162528).

Almost surely, 2^51251353251 is an apocalyptic number.

51251353251 is a deficient number, since it is larger than the sum of its proper divisors (26845946973).

51251353251 is a wasteful number, since it uses less digits than its factorization.

51251353251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440540641.

The product of its digits is 22500, while the sum is 33.

Adding to 51251353251 its reverse (15235315215), we get a palindrome (66486668466).

The spelling of 51251353251 in words is "fifty-one billion, two hundred fifty-one million, three hundred fifty-three thousand, two hundred fifty-one".