8120532989 has 2 divisors, whose sum is σ = 8120532990. Its totient is φ = 8120532988.

The previous prime is 8120532983. The next prime is 8120532997. The reversal of 8120532989 is 9892350218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4281739225 + 3838793764 = 65435^2 + 61958^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120532989 - 2¹² = 8120528893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8120532983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060266494 + 4060266495.

It is an arithmetic number, because the mean of its divisors is an integer number (4060266495).

Almost surely, 2^8120532989 is an apocalyptic number.

It is an amenable number.

8120532989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8120532989 is an equidigital number, since it uses as much as digits as its factorization.

8120532989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 8120532989 is about 90113.9999611603. Note that the first 4 decimals coincide. The cubic root of 8120532989 is about 2009.9943886546.

The spelling of 8120532989 in words is "eight billion, one hundred twenty million, five hundred thirty-two thousand, nine hundred eighty-nine".