51438642321413 has 2 divisors, whose sum is σ = 51438642321414. Its totient is φ = 51438642321412.

The previous prime is 51438642321383. The next prime is 51438642321481. The reversal of 51438642321413 is 31412324683415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34912522977124 + 16526119344289 = 5908682^2 + 4065233^2 .

It is a cyclic number.

It is not a de Polignac number, because 51438642321413 - 2³⁶ = 51369922844677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51438642321013) 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, 25719321160706 + 25719321160707.

It is an arithmetic number, because the mean of its divisors is an integer number (25719321160707).

Almost surely, 2^{51438642321413} is an apocalyptic number.

It is an amenable number.

51438642321413 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438642321413 is an equidigital number, since it uses as much as digits as its factorization.

51438642321413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 47.

The spelling of 51438642321413 in words is "fifty-one trillion, four hundred thirty-eight billion, six hundred forty-two million, three hundred twenty-one thousand, four hundred thirteen".