13161865 has 8 divisors (see below), whose sum is σ = 16481088. Its totient is φ = 10071600.

The previous prime is 13161857. The next prime is 13161881. The reversal of 13161865 is 56816131.

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

It is not a de Polignac number, because 13161865 - 2³ = 13161857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57111 + ... + 57340.

It is an arithmetic number, because the mean of its divisors is an integer number (2060136).

Almost surely, 2^13161865 is an apocalyptic number.

It is an amenable number.

13161865 is a deficient number, since it is larger than the sum of its proper divisors (3319223).

13161865 is a wasteful number, since it uses less digits than its factorization.

13161865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114479.

The product of its digits is 4320, while the sum is 31.

The square root of 13161865 is about 3627.9284722828. The cubic root of 13161865 is about 236.1053405536.

Adding to 13161865 its reverse (56816131), we get a palindrome (69977996).

The spelling of 13161865 in words is "thirteen million, one hundred sixty-one thousand, eight hundred sixty-five".