13131645 has 8 divisors (see below), whose sum is σ = 21010656. Its totient is φ = 7003536.

The previous prime is 13131623. The next prime is 13131649. The reversal of 13131645 is 54613131.

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

It is not a de Polignac number, because 13131645 - 2⁶ = 13131581 is a prime.

It is a Curzon number.

It is a congruent number.

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, 437707 + ... + 437736.

It is an arithmetic number, because the mean of its divisors is an integer number (2626332).

Almost surely, 2^13131645 is an apocalyptic number.

13131645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13131645 is a deficient number, since it is larger than the sum of its proper divisors (7879011).

13131645 is an equidigital number, since it uses as much as digits as its factorization.

13131645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875451.

The product of its digits is 1080, while the sum is 24.

The square root of 13131645 is about 3623.7611676268. The cubic root of 13131645 is about 235.9245006507.

Adding to 13131645 its reverse (54613131), we get a palindrome (67744776).

The spelling of 13131645 in words is "thirteen million, one hundred thirty-one thousand, six hundred forty-five".