122542009 has 4 divisors (see below), whose sum is σ = 122895504. Its totient is φ = 122188516.

The previous prime is 122542003. The next prime is 122542027. The reversal of 122542009 is 900245221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900245221 = 137 ⋅6571133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122542009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122542003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176227 + ... + 176920.

It is an arithmetic number, because the mean of its divisors is an integer number (30723876).

Almost surely, 2^122542009 is an apocalyptic number.

It is an amenable number.

122542009 is a deficient number, since it is larger than the sum of its proper divisors (353495).

122542009 is an equidigital number, since it uses as much as digits as its factorization.

122542009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353494.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 122542009 is about 11069.8694210907. The cubic root of 122542009 is about 496.7009592005.

It can be divided in two parts, 1225 and 42009, that added together give a palindrome (43234).

The spelling of 122542009 in words is "one hundred twenty-two million, five hundred forty-two thousand, nine".