51211201551 has 32 divisors (see below), whose sum is σ = 70736716800. Its totient is φ = 32936471040.

The previous prime is 51211201549. The next prime is 51211201579. The reversal of 51211201551 is 15510211215.

It is not a de Polignac number, because 51211201551 - 2¹ = 51211201549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211201501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4147555 + ... + 4159883.

It is an arithmetic number, because the mean of its divisors is an integer number (2210522400).

Almost surely, 2^51211201551 is an apocalyptic number.

51211201551 is a deficient number, since it is larger than the sum of its proper divisors (19525515249).

51211201551 is a wasteful number, since it uses less digits than its factorization.

51211201551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12799.

The product of its (nonzero) digits is 500, while the sum is 24.

Adding to 51211201551 its reverse (15510211215), we get a palindrome (66721412766).

The spelling of 51211201551 in words is "fifty-one billion, two hundred eleven million, two hundred one thousand, five hundred fifty-one".