1000020997 has 2 divisors, whose sum is σ = 1000020998. Its totient is φ = 1000020996.

The previous prime is 1000020991. The next prime is 1000021003. The reversal of 1000020997 is 7990200001.

1000020997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (1000020991) and next prime (1000021003).

It can be written as a sum of positive squares in only one way, i.e., 992628036 + 7392961 = 31506^2 + 2719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000020997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000020991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010498 + 500010499.

It is an arithmetic number, because the mean of its divisors is an integer number (500010499).

Almost surely, 2^1000020997 is an apocalyptic number.

It is an amenable number.

1000020997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000020997 is an equidigital number, since it uses as much as digits as its factorization.

1000020997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 1000020997 is about 31623.1085916613. The cubic root of 1000020997 is about 1000.0069989510.

Adding to 1000020997 its reverse (7990200001), we get a palindrome (8990220998).

The spelling of 1000020997 in words is "one billion, twenty thousand, nine hundred ninety-seven".