51211012551 has 32 divisors (see below), whose sum is σ = 73448077248. Its totient is φ = 31624888320.

The previous prime is 51211012547. The next prime is 51211012673. The reversal of 51211012551 is 15521011215.

It is not a de Polignac number, because 51211012551 - 2² = 51211012547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211012351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 866811 + ... + 924003.

It is an arithmetic number, because the mean of its divisors is an integer number (2295252414).

Almost surely, 2^51211012551 is an apocalyptic number.

51211012551 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51211012551 is a deficient number, since it is larger than the sum of its proper divisors (22237064697).

51211012551 is a wasteful number, since it uses less digits than its factorization.

51211012551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57491.

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

Adding to 51211012551 its reverse (15521011215), we get a palindrome (66732023766).

The spelling of 51211012551 in words is "fifty-one billion, two hundred eleven million, twelve thousand, five hundred fifty-one".