223512561 has 32 divisors (see below), whose sum is σ = 350208000. Its totient is φ = 140498064.

The previous prime is 223512559. The next prime is 223512571. The reversal of 223512561 is 165215322.

It is a happy number.

It is not a de Polignac number, because 223512561 - 2¹ = 223512559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (223512521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121696 + ... + 123518.

It is an arithmetic number, because the mean of its divisors is an integer number (10944000).

Almost surely, 2^223512561 is an apocalyptic number.

It is an amenable number.

223512561 is a deficient number, since it is larger than the sum of its proper divisors (126695439).

223512561 is a wasteful number, since it uses less digits than its factorization.

223512561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090 (or 2084 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 223512561 is about 14950.3364845076. The cubic root of 223512561 is about 606.8769530572.

Adding to 223512561 its reverse (165215322), we get a palindrome (388727883).

The spelling of 223512561 in words is "two hundred twenty-three million, five hundred twelve thousand, five hundred sixty-one".