681994867 has 2 divisors, whose sum is σ = 681994868. Its totient is φ = 681994866.

The previous prime is 681994853. The next prime is 681994871. The reversal of 681994867 is 768499186.

681994867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681994867 - 2¹¹ = 681992819 is a prime.

It is a super-2 number, since 2×681994867² = 930233997228695378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (681994837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340997433 + 340997434.

It is an arithmetic number, because the mean of its divisors is an integer number (340997434).

Almost surely, 2^681994867 is an apocalyptic number.

681994867 is a deficient number, since it is larger than the sum of its proper divisors (1).

681994867 is an equidigital number, since it uses as much as digits as its factorization.

681994867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The square root of 681994867 is about 26115.0314378520. The cubic root of 681994867 is about 880.2250057385.

The spelling of 681994867 in words is "six hundred eighty-one million, nine hundred ninety-four thousand, eight hundred sixty-seven".