22197561 has 8 divisors (see below), whose sum is σ = 29629824. Its totient is φ = 14781840.

The previous prime is 22197551. The next prime is 22197587. The reversal of 22197561 is 16579122.

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

It is not a de Polignac number, because 22197561 - 2¹¹ = 22195513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22197541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (3703728).

Almost surely, 2^22197561 is an apocalyptic number.

It is an amenable number.

22197561 is a deficient number, since it is larger than the sum of its proper divisors (7432263).

22197561 is a wasteful number, since it uses less digits than its factorization.

22197561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8271.

The product of its digits is 7560, while the sum is 33.

The square root of 22197561 is about 4711.4287641861. The cubic root of 22197561 is about 281.0401828699.

The spelling of 22197561 in words is "twenty-two million, one hundred ninety-seven thousand, five hundred sixty-one".