122842409 has 2 divisors, whose sum is σ = 122842410. Its totient is φ = 122842408.

The previous prime is 122842373. The next prime is 122842411. The reversal of 122842409 is 904248221.

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., 67190809 + 55651600 = 8197^2 + 7460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122842409 is a prime.

Together with 122842411, 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 (122842439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61421204 + 61421205.

It is an arithmetic number, because the mean of its divisors is an integer number (61421205).

Almost surely, 2^122842409 is an apocalyptic number.

It is an amenable number.

122842409 is a deficient number, since it is larger than the sum of its proper divisors (1).

122842409 is an equidigital number, since it uses as much as digits as its factorization.

122842409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 122842409 is about 11083.4294782797. The cubic root of 122842409 is about 497.1064996115.

The spelling of 122842409 in words is "one hundred twenty-two million, eight hundred forty-two thousand, four hundred nine".