1000981489 has 4 divisors (see below), whose sum is σ = 1001105380. Its totient is φ = 1000857600.

The previous prime is 1000981483. The next prime is 1000981493. The reversal of 1000981489 is 9841890001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 404010000 + 596971489 = 20100^2 + 24433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000981489 - 2³ = 1000981481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000981481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48912 + ... + 66289.

It is an arithmetic number, because the mean of its divisors is an integer number (250276345).

Almost surely, 2^1000981489 is an apocalyptic number.

It is an amenable number.

1000981489 is a deficient number, since it is larger than the sum of its proper divisors (123891).

1000981489 is an equidigital number, since it uses as much as digits as its factorization.

1000981489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123890.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 1000981489 is about 31638.2914993841. The cubic root of 1000981489 is about 1000.3270560227.

The spelling of 1000981489 in words is "one billion, nine hundred eighty-one thousand, four hundred eighty-nine".