22191409 has 8 divisors (see below), whose sum is σ = 24307560. Its totient is φ = 20165376.

The previous prime is 22191401. The next prime is 22191427. The reversal of 22191409 is 90419122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1288225 + 20903184 = 1135^2 + 4572^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22191409 - 2³ = 22191401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22191401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22014 + ... + 22999.

It is an arithmetic number, because the mean of its divisors is an integer number (3038445).

Almost surely, 2^22191409 is an apocalyptic number.

22191409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22191409 is a deficient number, since it is larger than the sum of its proper divisors (2116151).

22191409 is a wasteful number, since it uses less digits than its factorization.

22191409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45059.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 22191409 is about 4710.7758384368. The cubic root of 22191409 is about 281.0142172701.

The spelling of 22191409 in words is "twenty-two million, one hundred ninety-one thousand, four hundred nine".