1020001289 has 2 divisors, whose sum is σ = 1020001290. Its totient is φ = 1020001288.

The previous prime is 1020001273. The next prime is 1020001291. The reversal of 1020001289 is 9821000201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1019205625 + 795664 = 31925^2 + 892^2 .

It is an emirp because it is prime and its reverse (9821000201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020001289 - 2⁴ = 1020001273 is a prime.

Together with 1020001291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1020001259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000644 + 510000645.

It is an arithmetic number, because the mean of its divisors is an integer number (510000645).

Almost surely, 2^1020001289 is an apocalyptic number.

It is an amenable number.

1020001289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020001289 is an equidigital number, since it uses as much as digits as its factorization.

1020001289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1020001289 is about 31937.4590254140. The cubic root of 1020001289 is about 1006.6231335915.

The spelling of 1020001289 in words is "one billion, twenty million, one thousand, two hundred eighty-nine".