13181945 has 8 divisors (see below), whose sum is σ = 18078144. Its totient is φ = 9039024.

The previous prime is 13181941. The next prime is 13181963. The reversal of 13181945 is 54918131.

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

It is a cyclic number.

It is not a de Polignac number, because 13181945 - 2² = 13181941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13181941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188279 + ... + 188348.

It is an arithmetic number, because the mean of its divisors is an integer number (2259768).

Almost surely, 2^13181945 is an apocalyptic number.

It is an amenable number.

13181945 is a deficient number, since it is larger than the sum of its proper divisors (4896199).

13181945 is an equidigital number, since it uses as much as digits as its factorization.

13181945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376639.

The product of its digits is 4320, while the sum is 32.

The square root of 13181945 is about 3630.6948370801. The cubic root of 13181945 is about 236.2253485285.

The spelling of 13181945 in words is "thirteen million, one hundred eighty-one thousand, nine hundred forty-five".