13171985 has 16 divisors (see below), whose sum is σ = 16851456. Its totient is φ = 9860928.

The previous prime is 13171973. The next prime is 13171987. The reversal of 13171985 is 58917131.

13171985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13171985 - 2⁸ = 13171729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13171987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4187 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (1053216).

Almost surely, 2^13171985 is an apocalyptic number.

It is an amenable number.

13171985 is a deficient number, since it is larger than the sum of its proper divisors (3679471).

13171985 is a wasteful number, since it uses less digits than its factorization.

13171985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its digits is 7560, while the sum is 35.

The square root of 13171985 is about 3629.3229396128. The cubic root of 13171985 is about 236.1658379050.

The spelling of 13171985 in words is "thirteen million, one hundred seventy-one thousand, nine hundred eighty-five".