22185861 has 4 divisors (see below), whose sum is σ = 29581152. Its totient is φ = 14790572.

The previous prime is 22185851. The next prime is 22185907. The reversal of 22185861 is 16858122.

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.

It is a cyclic number.

It is not a de Polignac number, because 22185861 - 2⁷ = 22185733 is a prime.

It is a super-2 number, since 2×22185861² = 984424856622642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22185811) 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, 3697641 + ... + 3697646.

It is an arithmetic number, because the mean of its divisors is an integer number (7395288).

Almost surely, 2^22185861 is an apocalyptic number.

It is an amenable number.

22185861 is a deficient number, since it is larger than the sum of its proper divisors (7395291).

22185861 is an equidigital number, since it uses as much as digits as its factorization.

22185861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7395290.

The product of its digits is 7680, while the sum is 33.

The square root of 22185861 is about 4710.1869389654. The cubic root of 22185861 is about 280.9907968432.

The spelling of 22185861 in words is "twenty-two million, one hundred eighty-five thousand, eight hundred sixty-one".