122016409 has 4 divisors (see below), whose sum is σ = 124016740. Its totient is φ = 120016080.

The previous prime is 122016373. The next prime is 122016437. The reversal of 122016409 is 904610221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904610221 = 43 ⋅21037447.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 63952009 = 7620^2 + 7997^2 .

It is a cyclic number.

It is not a de Polignac number, because 122016409 - 2⁷ = 122016281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122016469) 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, 1000074 + ... + 1000195.

It is an arithmetic number, because the mean of its divisors is an integer number (31004185).

Almost surely, 2^122016409 is an apocalyptic number.

It is an amenable number.

122016409 is a deficient number, since it is larger than the sum of its proper divisors (2000331).

122016409 is an equidigital number, since it uses as much as digits as its factorization.

122016409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000330.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 122016409 is about 11046.1037927407. The cubic root of 122016409 is about 495.9898012666.

The spelling of 122016409 in words is "one hundred twenty-two million, sixteen thousand, four hundred nine".