681346769 has 2 divisors, whose sum is σ = 681346770. Its totient is φ = 681346768.

The previous prime is 681346763. The next prime is 681346811. The reversal of 681346769 is 967643186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470022400 + 211324369 = 21680^2 + 14537^2 .

It is a cyclic number.

It is not a de Polignac number, because 681346769 - 2⁸ = 681346513 is a prime.

It is a super-2 number, since 2×681346769² = 928466839253478722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (681346763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340673384 + 340673385.

It is an arithmetic number, because the mean of its divisors is an integer number (340673385).

Almost surely, 2^681346769 is an apocalyptic number.

It is an amenable number.

681346769 is a deficient number, since it is larger than the sum of its proper divisors (1).

681346769 is an equidigital number, since it uses as much as digits as its factorization.

681346769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 50.

The square root of 681346769 is about 26102.6199642871. The cubic root of 681346769 is about 879.9460921695.

The spelling of 681346769 in words is "six hundred eighty-one million, three hundred forty-six thousand, seven hundred sixty-nine".