22171409 has 4 divisors (see below), whose sum is σ = 23876916. Its totient is φ = 20465904.

The previous prime is 22171397. The next prime is 22171411. The reversal of 22171409 is 90417122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7579009 + 14592400 = 2753^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 22171409 - 2⁸ = 22171153 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 (22171909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852734 + ... + 852759.

It is an arithmetic number, because the mean of its divisors is an integer number (5969229).

Almost surely, 2^22171409 is an apocalyptic number.

It is an amenable number.

22171409 is a deficient number, since it is larger than the sum of its proper divisors (1705507).

22171409 is a wasteful number, since it uses less digits than its factorization.

22171409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705506.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 22171409 is about 4708.6525673488. The cubic root of 22171409 is about 280.9297705725.

The spelling of 22171409 in words is "twenty-two million, one hundred seventy-one thousand, four hundred nine".