22149817 has 4 divisors (see below), whose sum is σ = 22162660. Its totient is φ = 22136976.

The previous prime is 22149811. The next prime is 22149833. The reversal of 22149817 is 71894122.

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 10732176 + 11417641 = 3276^2 + 3379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22149817 is a prime.

It is a super-2 number, since 2×22149817² = 981228786266978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22149811) 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, 3342 + ... + 7447.

It is an arithmetic number, because the mean of its divisors is an integer number (5540665).

Almost surely, 2^22149817 is an apocalyptic number.

It is an amenable number.

22149817 is a deficient number, since it is larger than the sum of its proper divisors (12843).

22149817 is a wasteful number, since it uses less digits than its factorization.

22149817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12842.

The product of its digits is 8064, while the sum is 34.

The square root of 22149817 is about 4706.3592085603. The cubic root of 22149817 is about 280.8385448896.

The spelling of 22149817 in words is "twenty-two million, one hundred forty-nine thousand, eight hundred seventeen".