2631 has 4 divisors (see below), whose sum is σ = 3512. Its totient is φ = 1752.

The previous prime is 2621. The next prime is 2633. The reversal of 2631 is 1362.

2631 is nontrivially palindromic in base 14.

2631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2631 - 2⁷ = 2503 is a prime.

It is a super-2 number, since 2×2631² = 13844322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

2631 is an undulating number in base 14.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2631.

It is not an unprimeable number, because it can be changed into a prime (2633) 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, 436 + ... + 441.

It is an arithmetic number, because the mean of its divisors is an integer number (878).

2631 is a deficient number, since it is larger than the sum of its proper divisors (881).

2631 is an equidigital number, since it uses as much as digits as its factorization.

2631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its digits is 36, while the sum is 12.

The square root of 2631 is about 51.2932744129. The cubic root of 2631 is about 13.8051230716.

Adding to 2631 its reverse (1362), we get a palindrome (3993).

The spelling of 2631 in words is "two thousand, six hundred thirty-one".