51214647786481 has 3 divisors (see below), whose sum is σ = 51214654942923. Its totient is φ = 51214640630040.

The previous prime is 51214647786461. The next prime is 51214647786499. The reversal of 51214647786481 is 18468774641215.

The square root of 51214647786481 is 7156441.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 457572426481 + 50757075360000 = 676441^2 + 7124400^2 .

It is not a de Polignac number, because 51214647786481 - 2⁹ = 51214647785969 is a prime.

It is a super-2 number, since 2×51214647786481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51214647786461) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3578221 + ... + 10734661.

It is an arithmetic number, because the mean of its divisors is an integer number (17071551647641).

Almost surely, 2^{51214647786481} is an apocalyptic number.

51214647786481 is the 7156441-st square number.

51214647786481 is the 3578221-st centered octagonal number.

It is an amenable number.

51214647786481 is a deficient number, since it is larger than the sum of its proper divisors (7156442).

51214647786481 is an frugal number, since it uses more digits than its factorization.

51214647786481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14312882 (or 7156441 counting only the distinct ones).

The product of its digits is 72253440, while the sum is 64.

The spelling of 51214647786481 in words is "fifty-one trillion, two hundred fourteen billion, six hundred forty-seven million, seven hundred eighty-six thousand, four hundred eighty-one".