13171957 has 4 divisors (see below), whose sum is σ = 13946796. Its totient is φ = 12397120.

The previous prime is 13171943. The next prime is 13171973. The reversal of 13171957 is 75917131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8532241 + 4639716 = 2921^2 + 2154^2 .

It is a cyclic number.

It is not a de Polignac number, because 13171957 - 2²³ = 4783349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13171937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387394 + ... + 387427.

It is an arithmetic number, because the mean of its divisors is an integer number (3486699).

Almost surely, 2^13171957 is an apocalyptic number.

13171957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13171957 is a deficient number, since it is larger than the sum of its proper divisors (774839).

13171957 is an equidigital number, since it uses as much as digits as its factorization.

13171957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774838.

The product of its digits is 6615, while the sum is 34.

The square root of 13171957 is about 3629.3190821420. The cubic root of 13171957 is about 236.1656705638.

The spelling of 13171957 in words is "thirteen million, one hundred seventy-one thousand, nine hundred fifty-seven".