681992107 has 2 divisors, whose sum is σ = 681992108. Its totient is φ = 681992106.

The previous prime is 681992093. The next prime is 681992141. The reversal of 681992107 is 701299186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681992107 - 2⁷ = 681991979 is a prime.

It is a super-2 number, since 2×681992107² = 930226468020598898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681992147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340996053 + 340996054.

It is an arithmetic number, because the mean of its divisors is an integer number (340996054).

Almost surely, 2^681992107 is an apocalyptic number.

681992107 is a deficient number, since it is larger than the sum of its proper divisors (1).

681992107 is an equidigital number, since it uses as much as digits as its factorization.

681992107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 681992107 is about 26114.9785946686. The cubic root of 681992107 is about 880.2238183277.

The spelling of 681992107 in words is "six hundred eighty-one million, nine hundred ninety-two thousand, one hundred seven".