13181445 has 12 divisors (see below), whose sum is σ = 22847916. Its totient is φ = 7030080.

The previous prime is 13181423. The next prime is 13181453. The reversal of 13181445 is 54418131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8946081 + 4235364 = 2991^2 + 2058^2 .

It is not a de Polignac number, because 13181445 - 2⁷ = 13181317 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146416 + ... + 146505.

It is an arithmetic number, because the mean of its divisors is an integer number (1903993).

Almost surely, 2^13181445 is an apocalyptic number.

13181445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13181445 is a deficient number, since it is larger than the sum of its proper divisors (9666471).

13181445 is a wasteful number, since it uses less digits than its factorization.

13181445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292932 (or 292929 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 13181445 is about 3630.6259790840. The cubic root of 13181445 is about 236.2223617622. Note that the first 3 decimals are identical.

Adding to 13181445 its reverse (54418131), we get a palindrome (67599576).

The spelling of 13181445 in words is "thirteen million, one hundred eighty-one thousand, four hundred forty-five".