1001023489 has 2 divisors, whose sum is σ = 1001023490. Its totient is φ = 1001023488.

The previous prime is 1001023459. The next prime is 1001023501. The reversal of 1001023489 is 9843201001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680792464 + 320231025 = 26092^2 + 17895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001023489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001023459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500511744 + 500511745.

It is an arithmetic number, because the mean of its divisors is an integer number (500511745).

Almost surely, 2^1001023489 is an apocalyptic number.

It is an amenable number.

1001023489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001023489 is an equidigital number, since it uses as much as digits as its factorization.

1001023489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1001023489 is about 31638.9552450772. The cubic root of 1001023489 is about 1000.3410466739.

The spelling of 1001023489 in words is "one billion, one million, twenty-three thousand, four hundred eighty-nine".