681136699 has 2 divisors, whose sum is σ = 681136700. Its totient is φ = 681136698.

The previous prime is 681136691. The next prime is 681136711. The reversal of 681136699 is 996631186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681136699 - 2³ = 681136691 is a prime.

It is not a weakly prime, because it can be changed into another prime (681136691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340568349 + 340568350.

It is an arithmetic number, because the mean of its divisors is an integer number (340568350).

Almost surely, 2^681136699 is an apocalyptic number.

681136699 is a deficient number, since it is larger than the sum of its proper divisors (1).

681136699 is an equidigital number, since it uses as much as digits as its factorization.

681136699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 681136699 is about 26098.5957285062. The cubic root of 681136699 is about 879.8556491016.

The spelling of 681136699 in words is "six hundred eighty-one million, one hundred thirty-six thousand, six hundred ninety-nine".