22129409 has 2 divisors, whose sum is σ = 22129410. Its totient is φ = 22129408.

The previous prime is 22129361. The next prime is 22129417. The reversal of 22129409 is 90492122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 67600 = 4697^2 + 260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22129409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22129109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11064704 + 11064705.

It is an arithmetic number, because the mean of its divisors is an integer number (11064705).

Almost surely, 2^22129409 is an apocalyptic number.

It is an amenable number.

22129409 is a deficient number, since it is larger than the sum of its proper divisors (1).

22129409 is an equidigital number, since it uses as much as digits as its factorization.

22129409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 22129409 is about 4704.1905786224. The cubic root of 22129409 is about 280.7522670641.

The spelling of 22129409 in words is "twenty-two million, one hundred twenty-nine thousand, four hundred nine".