51451233481 has 2 divisors, whose sum is σ = 51451233482. Its totient is φ = 51451233480.

The previous prime is 51451233413. The next prime is 51451233487. The reversal of 51451233481 is 18433215415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36933152400 + 14518081081 = 192180^2 + 120491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51451233481 is a prime.

It is a super-4 number, since 4×51451233481⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51451233481.

It is not a weakly prime, because it can be changed into another prime (51451233487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725616740 + 25725616741.

It is an arithmetic number, because the mean of its divisors is an integer number (25725616741).

Almost surely, 2^51451233481 is an apocalyptic number.

It is an amenable number.

51451233481 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451233481 is an equidigital number, since it uses as much as digits as its factorization.

51451233481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 37.

Adding to 51451233481 its reverse (18433215415), we get a palindrome (69884448896).

The spelling of 51451233481 in words is "fifty-one billion, four hundred fifty-one million, two hundred thirty-three thousand, four hundred eighty-one".