122808509 has 4 divisors (see below), whose sum is σ = 125421504. Its totient is φ = 120195516.

The previous prime is 122808503. The next prime is 122808551. The reversal of 122808509 is 905808221.

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: 905808221 = 2347 ⋅385943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122808509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122808503) 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, 1306427 + ... + 1306520.

It is an arithmetic number, because the mean of its divisors is an integer number (31355376).

Almost surely, 2^122808509 is an apocalyptic number.

It is an amenable number.

122808509 is a deficient number, since it is larger than the sum of its proper divisors (2612995).

122808509 is an equidigital number, since it uses as much as digits as its factorization.

122808509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612994.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 122808509 is about 11081.9000627149. The cubic root of 122808509 is about 497.0607676832.

The spelling of 122808509 in words is "one hundred twenty-two million, eight hundred eight thousand, five hundred nine".