1000020120989 has 2 divisors, whose sum is σ = 1000020120990. Its totient is φ = 1000020120988.

The previous prime is 1000020120929. The next prime is 1000020121033. The reversal of 1000020120989 is 9890210200001.

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., 961086122500 + 38933998489 = 980350^2 + 197317^2 .

It is an emirp because it is prime and its reverse (9890210200001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000020120989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000020120929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010060494 + 500010060495.

It is an arithmetic number, because the mean of its divisors is an integer number (500010060495).

Almost surely, 2^{1000020120989} is an apocalyptic number.

It is an amenable number.

1000020120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000020120989 is an equidigital number, since it uses as much as digits as its factorization.

1000020120989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 1000020120989 in words is "one trillion, twenty million, one hundred twenty thousand, nine hundred eighty-nine".