22085561 has 4 divisors (see below), whose sum is σ = 22102272. Its totient is φ = 22068852.

The previous prime is 22085551. The next prime is 22085573. The reversal of 22085561 is 16558022.

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 22085561 - 2²² = 17891257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22085551) 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, 6185 + ... + 9078.

It is an arithmetic number, because the mean of its divisors is an integer number (5525568).

Almost surely, 2^22085561 is an apocalyptic number.

It is an amenable number.

22085561 is a deficient number, since it is larger than the sum of its proper divisors (16711).

22085561 is a wasteful number, since it uses less digits than its factorization.

22085561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16710.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 22085561 is about 4699.5277422311. The cubic root of 22085561 is about 280.5667136053.

The spelling of 22085561 in words is "twenty-two million, eighty-five thousand, five hundred sixty-one".