122091509 has 2 divisors, whose sum is σ = 122091510. Its totient is φ = 122091508.

The previous prime is 122091457. The next prime is 122091539. The reversal of 122091509 is 905190221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120516484 + 1575025 = 10978^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 122091509 - 2¹⁶ = 122025973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122091539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61045754 + 61045755.

It is an arithmetic number, because the mean of its divisors is an integer number (61045755).

Almost surely, 2^122091509 is an apocalyptic number.

It is an amenable number.

122091509 is a deficient number, since it is larger than the sum of its proper divisors (1).

122091509 is an equidigital number, since it uses as much as digits as its factorization.

122091509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 122091509 is about 11049.5026584910. The cubic root of 122091509 is about 496.0915394806.

It can be divided in two parts, 1220 and 91509, that added together give a palindrome (92729).

The spelling of 122091509 in words is "one hundred twenty-two million, ninety-one thousand, five hundred nine".