1020000999989 has 2 divisors, whose sum is σ = 1020000999990. Its totient is φ = 1020000999988.

The previous prime is 1020000999961. The next prime is 1020001000043. The reversal of 1020000999989 is 9899990000201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 667420373764 + 352580626225 = 816958^2 + 593785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020000999989 - 2³⁶ = 951281523253 is a prime.

It is a super-3 number, since 3×1020000999989³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020000999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000499994 + 510000499995.

It is an arithmetic number, because the mean of its divisors is an integer number (510000499995).

Almost surely, 2^{1020000999989} is an apocalyptic number.

It is an amenable number.

1020000999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020000999989 is an equidigital number, since it uses as much as digits as its factorization.

1020000999989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 56.

The spelling of 1020000999989 in words is "one trillion, twenty billion, nine hundred ninety-nine thousand, nine hundred eighty-nine".