51145631717 has 8 divisors (see below), whose sum is σ = 53136359640. Its totient is φ = 49170042880.

The previous prime is 51145631683. The next prime is 51145631791. The reversal of 51145631717 is 71713654115.

It is a Cunningham number, because it is equal to 226154²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 51145631716 = 1^2 + 226154^2 .

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

It is not a de Polignac number, because 51145631717 - 2¹⁰ = 51145630693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145630717) 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 7 ways as a sum of consecutive naturals, for example, 3777884 + ... + 3791397.

It is an arithmetic number, because the mean of its divisors is an integer number (6642044955).

Almost surely, 2^51145631717 is an apocalyptic number.

It is an amenable number.

51145631717 is a deficient number, since it is larger than the sum of its proper divisors (1990727923).

51145631717 is a wasteful number, since it uses less digits than its factorization.

51145631717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7569543.

The product of its digits is 88200, while the sum is 41.

The spelling of 51145631717 in words is "fifty-one billion, one hundred forty-five million, six hundred thirty-one thousand, seven hundred seventeen".