11722209 has 4 divisors (see below), whose sum is σ = 15629616. Its totient is φ = 7814804.

The previous prime is 11722201. The next prime is 11722283. The reversal of 11722209 is 90222711.

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: 90222711 = 3 ⋅30074237.

It is a cyclic number.

It is not a de Polignac number, because 11722209 - 2³ = 11722201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11722201) 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, 1953699 + ... + 1953704.

It is an arithmetic number, because the mean of its divisors is an integer number (3907404).

Almost surely, 2^11722209 is an apocalyptic number.

It is an amenable number.

11722209 is a deficient number, since it is larger than the sum of its proper divisors (3907407).

11722209 is an equidigital number, since it uses as much as digits as its factorization.

11722209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907406.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 11722209 is about 3423.7711664187. The cubic root of 11722209 is about 227.1624200660.

The spelling of 11722209 in words is "eleven million, seven hundred twenty-two thousand, two hundred nine".