623612561 has 8 divisors (see below), whose sum is σ = 732635904. Its totient is φ = 523311120.

The previous prime is 623612543. The next prime is 623612567. The reversal of 623612561 is 165216326.

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 623612561 - 2¹⁴ = 623596177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (623612567) 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, 2180321 + ... + 2180606.

It is an arithmetic number, because the mean of its divisors is an integer number (91579488).

Almost surely, 2^623612561 is an apocalyptic number.

It is an amenable number.

623612561 is a deficient number, since it is larger than the sum of its proper divisors (109023343).

623612561 is a wasteful number, since it uses less digits than its factorization.

623612561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360951.

The product of its digits is 12960, while the sum is 32.

The square root of 623612561 is about 24972.2358029873. The cubic root of 623612561 is about 854.3548413252.

Adding to 623612561 its reverse (165216326), we get a palindrome (788828887).

The spelling of 623612561 in words is "six hundred twenty-three million, six hundred twelve thousand, five hundred sixty-one".