51320213531 has 2 divisors, whose sum is σ = 51320213532. Its totient is φ = 51320213530.

The previous prime is 51320213521. The next prime is 51320213561. The reversal of 51320213531 is 13531202315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51320213531 - 2¹⁴ = 51320197147 is a prime.

It is a super-2 number, since 2×51320213531² (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 51320213531.

It is not a weakly prime, because it can be changed into another prime (51320213501) 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, 25660106765 + 25660106766.

It is an arithmetic number, because the mean of its divisors is an integer number (25660106766).

Almost surely, 2^51320213531 is an apocalyptic number.

51320213531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51320213531 is an equidigital number, since it uses as much as digits as its factorization.

51320213531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 51320213531 its reverse (13531202315), we get a palindrome (64851415846).

The spelling of 51320213531 in words is "fifty-one billion, three hundred twenty million, two hundred thirteen thousand, five hundred thirty-one".