13181545 has 32 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 8985600.

The previous prime is 13181533. The next prime is 13181549. The reversal of 13181545 is 54518131.

13181545 is a nontrivial binomial coefficient, being equal to C(5135, 2).

It is a de Polignac number, because none of the positive numbers 2^k-13181545 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13181549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87220 + ... + 87370.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^13181545 is an apocalyptic number.

13181545 is the 5134-th triangular number.

13181545 is the 1712-nd centered nonagonal number.

It is an amenable number.

13181545 is a deficient number, since it is larger than the sum of its proper divisors (5204375).

13181545 is a wasteful number, since it uses less digits than its factorization.

13181545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265.

The product of its digits is 2400, while the sum is 28.

The square root of 13181545 is about 3630.6397507877. The cubic root of 13181545 is about 236.2229591215. Note that the first 3 decimals are identical.

Adding to 13181545 its reverse (54518131), we get a palindrome (67699676).

The spelling of 13181545 in words is "thirteen million, one hundred eighty-one thousand, five hundred forty-five".