51239302313 has 2 divisors, whose sum is σ = 51239302314. Its totient is φ = 51239302312.

The previous prime is 51239302307. The next prime is 51239302337. The reversal of 51239302313 is 31320393215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51146988649 + 92313664 = 226157^2 + 9608^2 .

It is a cyclic number.

It is not a de Polignac number, because 51239302313 - 2¹⁸ = 51239040169 is a prime.

It is a super-2 number, since 2×51239302313² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51239302313.

It is not a weakly prime, because it can be changed into another prime (51239302363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25619651156 + 25619651157.

It is an arithmetic number, because the mean of its divisors is an integer number (25619651157).

Almost surely, 2^51239302313 is an apocalyptic number.

It is an amenable number.

51239302313 is a deficient number, since it is larger than the sum of its proper divisors (1).

51239302313 is an equidigital number, since it uses as much as digits as its factorization.

51239302313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 32.

Adding to 51239302313 its reverse (31320393215), we get a palindrome (82559695528).

The spelling of 51239302313 in words is "fifty-one billion, two hundred thirty-nine million, three hundred two thousand, three hundred thirteen".