122649809 has 2 divisors, whose sum is σ = 122649810. Its totient is φ = 122649808.

The previous prime is 122649773. The next prime is 122649811. The reversal of 122649809 is 908946221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120384784 + 2265025 = 10972^2 + 1505^2 .

It is an emirp because it is prime and its reverse (908946221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122649809 is a prime.

It is a Sophie Germain prime.

Together with 122649811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (122649829) 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, 61324904 + 61324905.

It is an arithmetic number, because the mean of its divisors is an integer number (61324905).

Almost surely, 2^122649809 is an apocalyptic number.

It is an amenable number.

122649809 is a deficient number, since it is larger than the sum of its proper divisors (1).

122649809 is an equidigital number, since it uses as much as digits as its factorization.

122649809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 122649809 is about 11074.7374235239. The cubic root of 122649809 is about 496.8465655128.

The spelling of 122649809 in words is "one hundred twenty-two million, six hundred forty-nine thousand, eight hundred nine".