51220055431 has 2 divisors, whose sum is σ = 51220055432. Its totient is φ = 51220055430.

The previous prime is 51220055417. The next prime is 51220055437. The reversal of 51220055431 is 13455002215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51220055431 - 2¹¹ = 51220053383 is a prime.

It is a super-2 number, since 2×51220055431² (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 51220055431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51220055437) 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 as a sum of consecutive naturals, namely, 25610027715 + 25610027716.

It is an arithmetic number, because the mean of its divisors is an integer number (25610027716).

Almost surely, 2^51220055431 is an apocalyptic number.

51220055431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51220055431 is an equidigital number, since it uses as much as digits as its factorization.

51220055431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 51220055431 its reverse (13455002215), we get a palindrome (64675057646).

The spelling of 51220055431 in words is "fifty-one billion, two hundred twenty million, fifty-five thousand, four hundred thirty-one".