13131643 has 8 divisors (see below), whose sum is σ = 15660288. Its totient is φ = 10766184.

The previous prime is 13131623. The next prime is 13131649. The reversal of 13131643 is 34613131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13131643 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13131649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40621 + ... + 40942.

It is an arithmetic number, because the mean of its divisors is an integer number (1957536).

Almost surely, 2^13131643 is an apocalyptic number.

13131643 is a deficient number, since it is larger than the sum of its proper divisors (2528645).

13131643 is an equidigital number, since it uses as much as digits as its factorization.

13131643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81593.

The product of its digits is 648, while the sum is 22.

The square root of 13131643 is about 3623.7608916704. The cubic root of 13131643 is about 235.9244886733.

Adding to 13131643 its reverse (34613131), we get a palindrome (47744774).

The spelling of 13131643 in words is "thirteen million, one hundred thirty-one thousand, six hundred forty-three".