51431100051 has 4 divisors (see below), whose sum is σ = 68574800072. Its totient is φ = 34287400032.

The previous prime is 51431100043. The next prime is 51431100137. The reversal of 51431100051 is 15000113415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51431100051 - 2³ = 51431100043 is a prime.

It is a super-4 number, since 4×51431100051⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51431104051) 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 3 ways as a sum of consecutive naturals, for example, 8571850006 + ... + 8571850011.

It is an arithmetic number, because the mean of its divisors is an integer number (17143700018).

Almost surely, 2^51431100051 is an apocalyptic number.

51431100051 is a deficient number, since it is larger than the sum of its proper divisors (17143700021).

51431100051 is a wasteful number, since it uses less digits than its factorization.

51431100051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17143700020.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 51431100051 its reverse (15000113415), we get a palindrome (66431213466).

The spelling of 51431100051 in words is "fifty-one billion, four hundred thirty-one million, one hundred thousand, fifty-one".