997000681 has 2 divisors, whose sum is σ = 997000682. Its totient is φ = 997000680.

The previous prime is 997000679. The next prime is 997000691. The reversal of 997000681 is 186000799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820536025 + 176464656 = 28645^2 + 13284^2 .

It is a cyclic number.

It is not a de Polignac number, because 997000681 - 2¹ = 997000679 is a prime.

It is a super-2 number, since 2×997000681² = 1988020715828927522, which contains 22 as substring.

Together with 997000679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997000691) 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, 498500340 + 498500341.

It is an arithmetic number, because the mean of its divisors is an integer number (498500341).

Almost surely, 2^997000681 is an apocalyptic number.

It is an amenable number.

997000681 is a deficient number, since it is larger than the sum of its proper divisors (1).

997000681 is an equidigital number, since it uses as much as digits as its factorization.

997000681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 997000681 is about 31575.3175914352. The cubic root of 997000681 is about 998.9992257851. Note that the first 3 decimals are identical.

The spelling of 997000681 in words is "nine hundred ninety-seven million, six hundred eighty-one", and thus it is an aban number.