681242702281 has 2 divisors, whose sum is σ = 681242702282. Its totient is φ = 681242702280.

The previous prime is 681242702269. The next prime is 681242702297. The reversal of 681242702281 is 182207242186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649386164025 + 31856538256 = 805845^2 + 178484^2 .

It is a cyclic number.

It is not a de Polignac number, because 681242702281 - 2¹¹ = 681242700233 is a prime.

It is a super-2 number, since 2×681242702281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681242702381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340621351140 + 340621351141.

It is an arithmetic number, because the mean of its divisors is an integer number (340621351141).

Almost surely, 2^681242702281 is an apocalyptic number.

It is an amenable number.

681242702281 is a deficient number, since it is larger than the sum of its proper divisors (1).

681242702281 is an equidigital number, since it uses as much as digits as its factorization.

681242702281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 681242702281 in words is "six hundred eighty-one billion, two hundred forty-two million, seven hundred two thousand, two hundred eighty-one".