51000042313 has 12 divisors (see below), whose sum is σ = 59355423540. Its totient is φ = 43636398080.

The previous prime is 51000042253. The next prime is 51000042343. The reversal of 51000042313 is 31324000015.

It can be written as a sum of positive squares in 2 ways, for example, as 29250576784 + 21749465529 = 171028^2 + 147477^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51000042313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51000042343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12394648 + ... + 12398761.

It is an arithmetic number, because the mean of its divisors is an integer number (4946285295).

Almost surely, 2^51000042313 is an apocalyptic number.

It is an amenable number.

51000042313 is a deficient number, since it is larger than the sum of its proper divisors (8355381227).

51000042313 is a wasteful number, since it uses less digits than its factorization.

51000042313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24793448 (or 24793437 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 51000042313 its reverse (31324000015), we get a palindrome (82324042328).

The spelling of 51000042313 in words is "fifty-one billion, forty-two thousand, three hundred thirteen".