1001020120489 has 2 divisors, whose sum is σ = 1001020120490. Its totient is φ = 1001020120488.

The previous prime is 1001020120433. The next prime is 1001020120501. The reversal of 1001020120489 is 9840210201001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999834006889 + 1186113600 = 999917^2 + 34440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001020120489 - 2¹⁵ = 1001020087721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001020120409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500510060244 + 500510060245.

It is an arithmetic number, because the mean of its divisors is an integer number (500510060245).

Almost surely, 2^{1001020120489} is an apocalyptic number.

It is an amenable number.

1001020120489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001020120489 is an equidigital number, since it uses as much as digits as its factorization.

1001020120489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 1001020120489 in words is "one trillion, one billion, twenty million, one hundred twenty thousand, four hundred eighty-nine".