223642561 has 8 divisors (see below), whose sum is σ = 226646784. Its totient is φ = 220654560.

The previous prime is 223642553. The next prime is 223642579. The reversal of 223642561 is 165246322.

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 223642561 - 2³ = 223642553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223642061) 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, 25080 + ... + 32806.

It is an arithmetic number, because the mean of its divisors is an integer number (28330848).

Almost surely, 2^223642561 is an apocalyptic number.

It is an amenable number.

223642561 is a deficient number, since it is larger than the sum of its proper divisors (3004223).

223642561 is a wasteful number, since it uses less digits than its factorization.

223642561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111.

The product of its digits is 17280, while the sum is 31.

The square root of 223642561 is about 14954.6835807382. The cubic root of 223642561 is about 606.9945880766.

Adding to 223642561 its reverse (165246322), we get a palindrome (388888883).

The spelling of 223642561 in words is "two hundred twenty-three million, six hundred forty-two thousand, five hundred sixty-one".