121532209 has 2 divisors, whose sum is σ = 121532210. Its totient is φ = 121532208.

The previous prime is 121532149. The next prime is 121532221. The reversal of 121532209 is 902235121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 91809 = 11020^2 + 303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121532209 is a prime.

It is not a weakly prime, because it can be changed into another prime (121532909) 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, 60766104 + 60766105.

It is an arithmetic number, because the mean of its divisors is an integer number (60766105).

Almost surely, 2^121532209 is an apocalyptic number.

It is an amenable number.

121532209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121532209 is an equidigital number, since it uses as much as digits as its factorization.

121532209 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 121532209 is about 11024.1647756191. The cubic root of 121532209 is about 495.3328496298.

The spelling of 121532209 in words is "one hundred twenty-one million, five hundred thirty-two thousand, two hundred nine".