51313240331 has 2 divisors, whose sum is σ = 51313240332. Its totient is φ = 51313240330.

The previous prime is 51313240271. The next prime is 51313240333. The reversal of 51313240331 is 13304231315.

51313240331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51313240331 - 2¹⁴ = 51313223947 is a prime.

It is a super-2 number, since 2×51313240331² (a number of 22 digits) contains 22 as substring.

Together with 51313240333, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51313240331.

It is not a weakly prime, because it can be changed into another prime (51313240333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656620165 + 25656620166.

It is an arithmetic number, because the mean of its divisors is an integer number (25656620166).

Almost surely, 2^51313240331 is an apocalyptic number.

51313240331 is a deficient number, since it is larger than the sum of its proper divisors (1).

51313240331 is an equidigital number, since it uses as much as digits as its factorization.

51313240331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 51313240331 its reverse (13304231315), we get a palindrome (64617471646).

The spelling of 51313240331 in words is "fifty-one billion, three hundred thirteen million, two hundred forty thousand, three hundred thirty-one".