681346811 has 2 divisors, whose sum is σ = 681346812. Its totient is φ = 681346810.

The previous prime is 681346769. The next prime is 681346817. The reversal of 681346811 is 118643186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681346811 - 2¹⁴ = 681330427 is a prime.

It is not a weakly prime, because it can be changed into another prime (681346817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340673405 + 340673406.

It is an arithmetic number, because the mean of its divisors is an integer number (340673406).

Almost surely, 2^681346811 is an apocalyptic number.

681346811 is a deficient number, since it is larger than the sum of its proper divisors (1).

681346811 is an equidigital number, since it uses as much as digits as its factorization.

681346811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 681346811 is about 26102.6207688040. The cubic root of 681346811 is about 879.9461102502.

Adding to 681346811 its reverse (118643186), we get a palindrome (799989997).

The spelling of 681346811 in words is "six hundred eighty-one million, three hundred forty-six thousand, eight hundred eleven".