1000206989 has 2 divisors, whose sum is σ = 1000206990. Its totient is φ = 1000206988.

The previous prime is 1000206979. The next prime is 1000207007. The reversal of 1000206989 is 9896020001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 975625225 + 24581764 = 31235^2 + 4958^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000206989 - 2¹² = 1000202893 is a prime.

It is a super-2 number, since 2×1000206989² = 2000828041688892242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000206919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500103494 + 500103495.

It is an arithmetic number, because the mean of its divisors is an integer number (500103495).

Almost surely, 2^1000206989 is an apocalyptic number.

It is an amenable number.

1000206989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000206989 is an equidigital number, since it uses as much as digits as its factorization.

1000206989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1000206989 is about 31626.0492157968. The cubic root of 1000206989 is about 1000.0689915734.

The spelling of 1000206989 in words is "one billion, two hundred six thousand, nine hundred eighty-nine".