633561 has 4 divisors (see below), whose sum is σ = 844752. Its totient is φ = 422372.

The previous prime is 633559. The next prime is 633569. The reversal of 633561 is 165336.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 633561 - 2¹ = 633559 is a prime.

It is a D-number.

633561 is a lucky number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (633569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105591 + ... + 105596.

It is an arithmetic number, because the mean of its divisors is an integer number (211188).

2⁶³³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

633561 is a deficient number, since it is larger than the sum of its proper divisors (211191).

633561 is a wasteful number, since it uses less digits than its factorization.

633561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211190.

The product of its digits is 1620, while the sum is 24.

The square root of 633561 is about 795.9654515116. The cubic root of 633561 is about 85.8874044784.

Adding to 633561 its reverse (165336), we get a palindrome (798897).

The spelling of 633561 in words is "six hundred thirty-three thousand, five hundred sixty-one".