631663 has 4 divisors (see below), whose sum is σ = 634608. Its totient is φ = 628720.

The previous prime is 631643. The next prime is 631667. The reversal of 631663 is 366136.

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

It is a cyclic number.

It is not a de Polignac number, because 631663 - 2⁹ = 631151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631667) 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, 1123 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (158652).

2⁶³¹⁶⁶³ is an apocalyptic number.

631663 is a deficient number, since it is larger than the sum of its proper divisors (2945).

631663 is a wasteful number, since it uses less digits than its factorization.

631663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944.

The product of its digits is 1944, while the sum is 25.

The square root of 631663 is about 794.7722944341. The cubic root of 631663 is about 85.8015525245.

Adding to 631663 its reverse (366136), we get a palindrome (997799).

The spelling of 631663 in words is "six hundred thirty-one thousand, six hundred sixty-three".