633478561 has 3 divisors (see below), whose sum is σ = 633503731. Its totient is φ = 633453392.

The previous prime is 633478507. The next prime is 633478589. The reversal of 633478561 is 165874336.

The square root of 633478561 is 25169.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 152992161 + 480486400 = 12369^2 + 21920^2 .

It is a de Polignac number, because none of the positive numbers 2^k-633478561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (633478661) 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 2 ways as a sum of consecutive naturals, for example, 12585 + ... + 37753.

Almost surely, 2^633478561 is an apocalyptic number.

633478561 is the 25169-th square number.

633478561 is the 12585-th centered octagonal number.

It is an amenable number.

633478561 is a deficient number, since it is larger than the sum of its proper divisors (25170).

633478561 is an frugal number, since it uses more digits than its factorization.

633478561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50338 (or 25169 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The cubic root of 633478561 is about 858.8367909190.

The spelling of 633478561 in words is "six hundred thirty-three million, four hundred seventy-eight thousand, five hundred sixty-one".