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13157 = 59223
BaseRepresentation
bin11001101100101
3200001022
43031211
5410112
6140525
753234
oct31545
920038
1013157
119981
127745
135cb1
144b1b
153d72
hex3365

13157 has 4 divisors (see below), whose sum is σ = 13440. Its totient is φ = 12876.

The previous prime is 13151. The next prime is 13159. The reversal of 13157 is 75131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75131 = 710733.

It is a cyclic number.

It is not a de Polignac number, because 13157 - 26 = 13093 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13151) 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, 53 + ... + 170.

It is an arithmetic number, because the mean of its divisors is an integer number (3360).

213157 is an apocalyptic number.

It is an amenable number.

13157 is a deficient number, since it is larger than the sum of its proper divisors (283).

13157 is an equidigital number, since it uses as much as digits as its factorization.

13157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282.

The product of its digits is 105, while the sum is 17.

The square root of 13157 is about 114.7039668015. The cubic root of 13157 is about 23.6076246550.

Adding to 13157 its reverse (75131), we get a palindrome (88288).

The spelling of 13157 in words is "thirteen thousand, one hundred fifty-seven".

Divisors: 1 59 223 13157