122153209 has 2 divisors, whose sum is σ = 122153210. Its totient is φ = 122153208.

The previous prime is 122153183. The next prime is 122153267. The reversal of 122153209 is 902351221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102819600 + 19333609 = 10140^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 122153209 - 2⁷ = 122153081 is a prime.

It is not a weakly prime, because it can be changed into another prime (122153509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61076604 + 61076605.

It is an arithmetic number, because the mean of its divisors is an integer number (61076605).

Almost surely, 2^122153209 is an apocalyptic number.

It is an amenable number.

122153209 is a deficient number, since it is larger than the sum of its proper divisors (1).

122153209 is an equidigital number, since it uses as much as digits as its factorization.

122153209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 122153209 is about 11052.2942867081. The cubic root of 122153209 is about 496.1750934573.

The spelling of 122153209 in words is "one hundred twenty-two million, one hundred fifty-three thousand, two hundred nine".