1005009989 has 2 divisors, whose sum is σ = 1005009990. Its totient is φ = 1005009988.

The previous prime is 1005009949. The next prime is 1005010003. The reversal of 1005009989 is 9899005001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717436225 + 287573764 = 26785^2 + 16958^2 .

It is an emirp because it is prime and its reverse (9899005001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1005009989 - 2²⁸ = 736574533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005009949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502504994 + 502504995.

It is an arithmetic number, because the mean of its divisors is an integer number (502504995).

Almost surely, 2^1005009989 is an apocalyptic number.

It is an amenable number.

1005009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005009989 is an equidigital number, since it uses as much as digits as its factorization.

1005009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 1005009989 is about 31701.8925144856. The cubic root of 1005009989 is about 1001.6672151821.

The spelling of 1005009989 in words is "one billion, five million, nine thousand, nine hundred eighty-nine".