1020120120989 has 2 divisors, whose sum is σ = 1020120120990. Its totient is φ = 1020120120988.

The previous prime is 1020120120979. The next prime is 1020120121021. The reversal of 1020120120989 is 9890210210201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 987721920964 + 32398200025 = 993842^2 + 179995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020120120989 - 2⁴ = 1020120120973 is a prime.

It is a super-2 number, since 2×1020120120989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020120120979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060060494 + 510060060495.

It is an arithmetic number, because the mean of its divisors is an integer number (510060060495).

Almost surely, 2^{1020120120989} is an apocalyptic number.

It is an amenable number.

1020120120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020120120989 is an equidigital number, since it uses as much as digits as its factorization.

1020120120989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 1020120120989 in words is "one trillion, twenty billion, one hundred twenty million, one hundred twenty thousand, nine hundred eighty-nine".