120999209 has 2 divisors, whose sum is σ = 120999210. Its totient is φ = 120999208.

The previous prime is 120999187. The next prime is 120999211. The reversal of 120999209 is 902999021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 1315609 = 10940^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 120999209 - 2⁸ = 120998953 is a prime.

Together with 120999211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120999259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60499604 + 60499605.

It is an arithmetic number, because the mean of its divisors is an integer number (60499605).

Almost surely, 2^120999209 is an apocalyptic number.

It is an amenable number.

120999209 is a deficient number, since it is larger than the sum of its proper divisors (1).

120999209 is an equidigital number, since it uses as much as digits as its factorization.

120999209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 120999209 is about 10999.9640453958. The cubic root of 120999209 is about 494.6076665387.

The spelling of 120999209 in words is "one hundred twenty million, nine hundred ninety-nine thousand, two hundred nine".