120209689 has 2 divisors, whose sum is σ = 120209690. Its totient is φ = 120209688.

The previous prime is 120209651. The next prime is 120209693. The reversal of 120209689 is 986902021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101848464 + 18361225 = 10092^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 120209689 - 2¹⁵ = 120176921 is a prime.

It is not a weakly prime, because it can be changed into another prime (120209699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60104844 + 60104845.

It is an arithmetic number, because the mean of its divisors is an integer number (60104845).

Almost surely, 2^120209689 is an apocalyptic number.

It is an amenable number.

120209689 is a deficient number, since it is larger than the sum of its proper divisors (1).

120209689 is an equidigital number, since it uses as much as digits as its factorization.

120209689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 120209689 is about 10964.0179222765. The cubic root of 120209689 is about 493.5295463210.

The spelling of 120209689 in words is "one hundred twenty million, two hundred nine thousand, six hundred eighty-nine".