4122138209 has 4 divisors (see below), whose sum is σ = 4711015104. Its totient is φ = 3533261316.

The previous prime is 4122138203. The next prime is 4122138227. The reversal of 4122138209 is 9028312214.

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: 9028312214 = 2 ⋅4514156107.

It is a cyclic number.

It is not a de Polignac number, because 4122138209 - 2²⁸ = 3853702753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4122138203) 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, 294438437 + ... + 294438450.

It is an arithmetic number, because the mean of its divisors is an integer number (1177753776).

Almost surely, 2^4122138209 is an apocalyptic number.

It is an amenable number.

4122138209 is a deficient number, since it is larger than the sum of its proper divisors (588876895).

4122138209 is an equidigital number, since it uses as much as digits as its factorization.

4122138209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588876894.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 4122138209 is about 64203.8800151517. The cubic root of 4122138209 is about 1603.3961986762.

The spelling of 4122138209 in words is "four billion, one hundred twenty-two million, one hundred thirty-eight thousand, two hundred nine".