5631231 has 4 divisors (see below), whose sum is σ = 7508312. Its totient is φ = 3754152.

The previous prime is 5631221. The next prime is 5631257. The reversal of 5631231 is 1321365.

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

It is not a de Polignac number, because 5631231 - 2⁹ = 5630719 is a prime.

It is a super-2 number, since 2×5631231² = 63421525150722, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5631198 and 5631207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938536 + ... + 938541.

It is an arithmetic number, because the mean of its divisors is an integer number (1877078).

Almost surely, 2^5631231 is an apocalyptic number.

5631231 is a deficient number, since it is larger than the sum of its proper divisors (1877081).

5631231 is a wasteful number, since it uses less digits than its factorization.

5631231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877080.

The product of its digits is 540, while the sum is 21.

The square root of 5631231 is about 2373.0214916852. The cubic root of 5631231 is about 177.9103091464.

Adding to 5631231 its reverse (1321365), we get a palindrome (6952596).

The spelling of 5631231 in words is "five million, six hundred thirty-one thousand, two hundred thirty-one".