13131631 has 4 divisors (see below), whose sum is σ = 13555264. Its totient is φ = 12708000.

The previous prime is 13131623. The next prime is 13131649. The reversal of 13131631 is 13613131.

13131631 is digitally balanced in base 3, 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 a cyclic number.

It is not a de Polignac number, because 13131631 - 2³ = 13131623 is a prime.

It is a super-2 number, since 2×13131631² = 344879465440322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131599 and 13131608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131661) 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, 211770 + ... + 211831.

It is an arithmetic number, because the mean of its divisors is an integer number (3388816).

Almost surely, 2^13131631 is an apocalyptic number.

13131631 is a deficient number, since it is larger than the sum of its proper divisors (423633).

13131631 is an equidigital number, since it uses as much as digits as its factorization.

13131631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423632.

The product of its digits is 162, while the sum is 19.

The square root of 13131631 is about 3623.7592359317. The cubic root of 13131631 is about 235.9244168088.

Adding to 13131631 its reverse (13613131), we get a palindrome (26744762).

The spelling of 13131631 in words is "thirteen million, one hundred thirty-one thousand, six hundred thirty-one".