13631231 has 4 divisors (see below), whose sum is σ = 13642200. Its totient is φ = 13620264.

The previous prime is 13631221. The next prime is 13631257. The reversal of 13631231 is 13213631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13213631 = 97 ⋅136223.

It is a cyclic number.

It is not a de Polignac number, because 13631231 - 2¹⁰ = 13630207 is a prime.

It is a super-2 number, since 2×13631231² = 371620917150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631221) 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, 3341 + ... + 6198.

It is an arithmetic number, because the mean of its divisors is an integer number (3410550).

Almost surely, 2^13631231 is an apocalyptic number.

13631231 is a deficient number, since it is larger than the sum of its proper divisors (10969).

13631231 is an equidigital number, since it uses as much as digits as its factorization.

13631231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968.

The product of its digits is 324, while the sum is 20.

The square root of 13631231 is about 3692.0497017240. The cubic root of 13631231 is about 238.8792127884.

Adding to 13631231 its reverse (13213631), we get a palindrome (26844862).

The spelling of 13631231 in words is "thirteen million, six hundred thirty-one thousand, two hundred thirty-one".