120665989 has 2 divisors, whose sum is σ = 120665990. Its totient is φ = 120665988.

The previous prime is 120665977. The next prime is 120666019. The reversal of 120665989 is 989566021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 55621764 = 8065^2 + 7458^2 .

It is a cyclic number.

It is not a de Polignac number, because 120665989 - 2⁵ = 120665957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120665929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60332994 + 60332995.

It is an arithmetic number, because the mean of its divisors is an integer number (60332995).

Almost surely, 2^120665989 is an apocalyptic number.

It is an amenable number.

120665989 is a deficient number, since it is larger than the sum of its proper divisors (1).

120665989 is an equidigital number, since it uses as much as digits as its factorization.

120665989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 120665989 is about 10984.8071899328. The cubic root of 120665989 is about 494.1532153815.

The spelling of 120665989 in words is "one hundred twenty million, six hundred sixty-five thousand, nine hundred eighty-nine".