681456341213 has 2 divisors, whose sum is σ = 681456341214. Its totient is φ = 681456341212.

The previous prime is 681456341119. The next prime is 681456341219. The reversal of 681456341213 is 312143654186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375667248889 + 305789092324 = 612917^2 + 552982^2 .

It is a cyclic number.

It is not a de Polignac number, because 681456341213 - 2²⁴ = 681439563997 is a prime.

It is a super-2 number, since 2×681456341213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681456341219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340728170606 + 340728170607.

It is an arithmetic number, because the mean of its divisors is an integer number (340728170607).

Almost surely, 2^681456341213 is an apocalyptic number.

It is an amenable number.

681456341213 is a deficient number, since it is larger than the sum of its proper divisors (1).

681456341213 is an equidigital number, since it uses as much as digits as its factorization.

681456341213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 44.

Adding to 681456341213 its reverse (312143654186), we get a palindrome (993599995399).

The spelling of 681456341213 in words is "six hundred eighty-one billion, four hundred fifty-six million, three hundred forty-one thousand, two hundred thirteen".