632531521 has 4 divisors (see below), whose sum is σ = 644466132. Its totient is φ = 620596912.

The previous prime is 632531513. The next prime is 632531561. The reversal of 632531521 is 125135236.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234090000 + 398441521 = 15300^2 + 19961^2 .

It is a cyclic number.

It is not a de Polignac number, because 632531521 - 2³ = 632531513 is a prime.

It is a super-2 number, since 2×632531521² = 800192250117146882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 632531521.

It is not an unprimeable number, because it can be changed into a prime (632531561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5967226 + ... + 5967331.

It is an arithmetic number, because the mean of its divisors is an integer number (161116533).

Almost surely, 2^632531521 is an apocalyptic number.

It is an amenable number.

632531521 is a deficient number, since it is larger than the sum of its proper divisors (11934611).

632531521 is a wasteful number, since it uses less digits than its factorization.

632531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11934610.

The product of its digits is 5400, while the sum is 28.

The square root of 632531521 is about 25150.1793432969. The cubic root of 632531521 is about 858.4085951873.

Adding to 632531521 its reverse (125135236), we get a palindrome (757666757).

The spelling of 632531521 in words is "six hundred thirty-two million, five hundred thirty-one thousand, five hundred twenty-one".