13381631 has 4 divisors (see below), whose sum is σ = 13601064. Its totient is φ = 13162200.

The previous prime is 13381597. The next prime is 13381633. The reversal of 13381631 is 13618331.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13381631 is a prime.

It is a super-2 number, since 2×13381631² = 358136096440322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13381631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13381633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109625 + ... + 109746.

It is an arithmetic number, because the mean of its divisors is an integer number (3400266).

Almost surely, 2^13381631 is an apocalyptic number.

13381631 is a deficient number, since it is larger than the sum of its proper divisors (219433).

13381631 is an equidigital number, since it uses as much as digits as its factorization.

13381631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219432.

The product of its digits is 1296, while the sum is 26.

The square root of 13381631 is about 3658.0911689022. The cubic root of 13381631 is about 237.4121913621.

Adding to 13381631 its reverse (13618331), we get a palindrome (26999962).

The spelling of 13381631 in words is "thirteen million, three hundred eighty-one thousand, six hundred thirty-one".