1001000989 has 2 divisors, whose sum is σ = 1001000990. Its totient is φ = 1001000988.

The previous prime is 1001000981. The next prime is 1001001011. The reversal of 1001000989 is 9890001001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 814132089 + 186868900 = 28533^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001000989 - 2³ = 1001000981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001000981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500500494 + 500500495.

It is an arithmetic number, because the mean of its divisors is an integer number (500500495).

Almost surely, 2^1001000989 is an apocalyptic number.

It is an amenable number.

1001000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001000989 is an equidigital number, since it uses as much as digits as its factorization.

1001000989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1001000989 is about 31638.5996687590. The cubic root of 1001000989 is about 1000.3335517309. Note that the first 3 decimals are identical.

The spelling of 1001000989 in words is "one billion, one million, nine hundred eighty-nine", and thus it is an aban number.