10685981 has 2 divisors, whose sum is σ = 10685982. Its totient is φ = 10685980.

The previous prime is 10685977. The next prime is 10686023. The reversal of 10685981 is 18958601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9665881 + 1020100 = 3109^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 10685981 - 2² = 10685977 is a prime.

It is a super-2 number, since 2×10685981² = 228380379864722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10685921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5342990 + 5342991.

It is an arithmetic number, because the mean of its divisors is an integer number (5342991).

Almost surely, 2^10685981 is an apocalyptic number.

It is an amenable number.

10685981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10685981 is an equidigital number, since it uses as much as digits as its factorization.

10685981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 10685981 is about 3268.9418777335. The cubic root of 10685981 is about 220.2612667380.

The spelling of 10685981 in words is "ten million, six hundred eighty-five thousand, nine hundred eighty-one".