623561 has 8 divisors (see below), whose sum is σ = 674880. Its totient is φ = 574128.

The previous prime is 623537. The next prime is 623563. The reversal of 623561 is 165326.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623563) 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, 260 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (84360).

2⁶²³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

623561 is a deficient number, since it is larger than the sum of its proper divisors (51319).

623561 is a wasteful number, since it uses less digits than its factorization.

623561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943.

The product of its digits is 1080, while the sum is 23.

The square root of 623561 is about 789.6587870720. The cubic root of 623561 is about 85.4331294331.

Adding to 623561 its reverse (165326), we get a palindrome (788887).

The spelling of 623561 in words is "six hundred twenty-three thousand, five hundred sixty-one".