51511453100321 has 2 divisors, whose sum is σ = 51511453100322. Its totient is φ = 51511453100320.

The previous prime is 51511453100273. The next prime is 51511453100323. The reversal of 51511453100321 is 12300135411515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41281460254225 + 10229992846096 = 6425065^2 + 3198436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51511453100321 is a prime.

Together with 51511453100323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51511453100323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755726550160 + 25755726550161.

It is an arithmetic number, because the mean of its divisors is an integer number (25755726550161).

Almost surely, 2^{51511453100321} is an apocalyptic number.

It is an amenable number.

51511453100321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511453100321 is an equidigital number, since it uses as much as digits as its factorization.

51511453100321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 51511453100321 its reverse (12300135411515), we get a palindrome (63811588511836).

The spelling of 51511453100321 in words is "fifty-one trillion, five hundred eleven billion, four hundred fifty-three million, one hundred thousand, three hundred twenty-one".