122605521509 has 2 divisors, whose sum is σ = 122605521510. Its totient is φ = 122605521508.

The previous prime is 122605521503. The next prime is 122605521529. The reversal of 122605521509 is 905125506221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65355388609 + 57250132900 = 255647^2 + 239270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122605521509 is a prime.

It is a super-2 number, since 2×122605521509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122605521503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61302760754 + 61302760755.

It is an arithmetic number, because the mean of its divisors is an integer number (61302760755).

Almost surely, 2^122605521509 is an apocalyptic number.

It is an amenable number.

122605521509 is a deficient number, since it is larger than the sum of its proper divisors (1).

122605521509 is an equidigital number, since it uses as much as digits as its factorization.

122605521509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 122605521509 in words is "one hundred twenty-two billion, six hundred five million, five hundred twenty-one thousand, five hundred nine".