51342554420981 has 2 divisors, whose sum is σ = 51342554420982. Its totient is φ = 51342554420980.

The previous prime is 51342554420977. The next prime is 51342554421061. The reversal of 51342554420981 is 18902445524315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50585750117956 + 756804303025 = 7112366^2 + 869945^2 .

It is a cyclic number.

It is not a de Polignac number, because 51342554420981 - 2² = 51342554420977 is a prime.

It is a super-2 number, since 2×51342554420981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51342554420281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25671277210490 + 25671277210491.

It is an arithmetic number, because the mean of its divisors is an integer number (25671277210491).

Almost surely, 2^{51342554420981} is an apocalyptic number.

It is an amenable number.

51342554420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51342554420981 is an equidigital number, since it uses as much as digits as its factorization.

51342554420981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912000, while the sum is 53.

The spelling of 51342554420981 in words is "fifty-one trillion, three hundred forty-two billion, five hundred fifty-four million, four hundred twenty thousand, nine hundred eighty-one".