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5631 = 31877

5631 has 4 divisors (see below), whose sum is σ = 7512. Its totient is φ = 3752.

The previous prime is 5623. The next prime is 5639. The reversal of 5631 is 1365.

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

It is an interprime number because it is at equal distance from previous prime (5623) and next prime (5639).

It is a cyclic number.

It is not a de Polignac number, because 5631 - 23 = 5623 is a prime.

It is a super-2 number, since 2×56312 = 63416322, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 4, base 8 and base 16.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 5631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (1878).

25631 is an apocalyptic number.

5631 is a deficient number, since it is larger than the sum of its proper divisors (1881).

5631 is a wasteful number, since it uses less digits than its factorization.

5631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its digits is 90, while the sum is 15.

The square root of 5631 is about 75.0399893390. The cubic root of 5631 is about 17.7907876413.

Adding to 5631 its reverse (1365), we get a palindrome (6996).

It can be divided in two parts, 5 and 631, that added together give a palindrome (636).

The spelling of 5631 in words is "five thousand, six hundred thirty-one".

Divisors: 1 3 1877 5631