56831309866381 has 2 divisors, whose sum is σ = 56831309866382. Its totient is φ = 56831309866380.

The previous prime is 56831309866301. The next prime is 56831309866391. The reversal of 56831309866381 is 18366890313865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54953680955625 + 1877628910756 = 7413075^2 + 1370266^2 .

It is a cyclic number.

It is not a de Polignac number, because 56831309866381 - 2³⁵ = 56796950128013 is a prime.

It is a super-2 number, since 2×56831309866381² (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 (56831309866301) 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, 28415654933190 + 28415654933191.

It is an arithmetic number, because the mean of its divisors is an integer number (28415654933191).

Almost surely, 2^{56831309866381} is an apocalyptic number.

It is an amenable number.

56831309866381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56831309866381 is an equidigital number, since it uses as much as digits as its factorization.

56831309866381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134369280, while the sum is 67.

The spelling of 56831309866381 in words is "fifty-six trillion, eight hundred thirty-one billion, three hundred nine million, eight hundred sixty-six thousand, three hundred eighty-one".