632631561 has 8 divisors (see below), whose sum is σ = 853671840. Its totient is φ = 416672832.

The previous prime is 632631541. The next prime is 632631569. The reversal of 632631561 is 165136236.

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

It is not a de Polignac number, because 632631561 - 2¹⁵ = 632598793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (632631569) 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, 1270096 + ... + 1270593.

It is an arithmetic number, because the mean of its divisors is an integer number (106708980).

Almost surely, 2^632631561 is an apocalyptic number.

It is an amenable number.

632631561 is a deficient number, since it is larger than the sum of its proper divisors (221040279).

632631561 is a wasteful number, since it uses less digits than its factorization.

632631561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540775.

The product of its digits is 19440, while the sum is 33.

The square root of 632631561 is about 25152.1681172817. The cubic root of 632631561 is about 858.4538475666.

Adding to 632631561 its reverse (165136236), we get a palindrome (797767797).

The spelling of 632631561 in words is "six hundred thirty-two million, six hundred thirty-one thousand, five hundred sixty-one".