51116501001521 has 2 divisors, whose sum is σ = 51116501001522. Its totient is φ = 51116501001520.

The previous prime is 51116501001497. The next prime is 51116501001529. The reversal of 51116501001521 is 12510010561115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34800265680625 + 16316235320896 = 5899175^2 + 4039336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51116501001521 is a prime.

It is a super-2 number, since 2×51116501001521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51116501001529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25558250500760 + 25558250500761.

It is an arithmetic number, because the mean of its divisors is an integer number (25558250500761).

Almost surely, 2^{51116501001521} is an apocalyptic number.

It is an amenable number.

51116501001521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51116501001521 is an equidigital number, since it uses as much as digits as its factorization.

51116501001521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 29.

Adding to 51116501001521 its reverse (12510010561115), we get a palindrome (63626511562636).

The spelling of 51116501001521 in words is "fifty-one trillion, one hundred sixteen billion, five hundred one million, one thousand, five hundred twenty-one".