3631631 has 4 divisors (see below), whose sum is σ = 3789552. Its totient is φ = 3473712.

The previous prime is 3631609. The next prime is 3631633. The reversal of 3631631 is 1361363.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3631631 is a prime.

It is a super-2 number, since 2×3631631² = 26377487440322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 157897 = 3631631 / (3 + 6 + 3 + 1 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3631597 and 3631606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3631633) 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 3 ways as a sum of consecutive naturals, for example, 78926 + ... + 78971.

It is an arithmetic number, because the mean of its divisors is an integer number (947388).

Almost surely, 2^3631631 is an apocalyptic number.

3631631 is a deficient number, since it is larger than the sum of its proper divisors (157921).

3631631 is a wasteful number, since it uses less digits than its factorization.

3631631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157920.

The product of its digits is 972, while the sum is 23.

The square root of 3631631 is about 1905.6838667523. The cubic root of 3631631 is about 153.7094510470.

Adding to 3631631 its reverse (1361363), we get a palindrome (4992994).

The spelling of 3631631 in words is "three million, six hundred thirty-one thousand, six hundred thirty-one".