263631 has 4 divisors (see below), whose sum is σ = 351512. Its totient is φ = 175752.

The previous prime is 263621. The next prime is 263647. The reversal of 263631 is 136362.

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

It is not a de Polignac number, because 263631 - 2⁶ = 263567 is a prime.

It is a super-2 number, since 2×263631² = 139002608322, which contains 22 as substring.

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 = 263598 and 263607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263611) 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, 43936 + ... + 43941.

It is an arithmetic number, because the mean of its divisors is an integer number (87878).

2²⁶³⁶³¹ is an apocalyptic number.

263631 is a deficient number, since it is larger than the sum of its proper divisors (87881).

263631 is an equidigital number, since it uses as much as digits as its factorization.

263631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87880.

The product of its digits is 648, while the sum is 21.

The square root of 263631 is about 513.4500949459. The cubic root of 263631 is about 64.1207842757.

Adding to 263631 its reverse (136362), we get a palindrome (399993).

The spelling of 263631 in words is "two hundred sixty-three thousand, six hundred thirty-one".