5631321 has 4 divisors (see below), whose sum is σ = 7508432. Its totient is φ = 3754212.

The previous prime is 5631317. The next prime is 5631341. The reversal of 5631321 is 1231365.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5631321 - 2² = 5631317 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (5631341) 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, 938551 + ... + 938556.

It is an arithmetic number, because the mean of its divisors is an integer number (1877108).

Almost surely, 2^5631321 is an apocalyptic number.

It is an amenable number.

5631321 is a deficient number, since it is larger than the sum of its proper divisors (1877111).

5631321 is a wasteful number, since it uses less digits than its factorization.

5631321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877110.

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

The square root of 5631321 is about 2373.0404547753. The cubic root of 5631321 is about 177.9112569464.

Adding to 5631321 its reverse (1231365), we get a palindrome (6862686).

The spelling of 5631321 in words is "five million, six hundred thirty-one thousand, three hundred twenty-one".