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19117 = 72731
BaseRepresentation
bin100101010101101
3222020001
410222231
51102432
6224301
7106510
oct45255
928201
1019117
11133aa
12b091
138917
146d77
1559e7

19117 has 4 divisors (see below), whose sum is σ = 21856. Its totient is φ = 16380.

The previous prime is 19087. The next prime is 19121. The reversal of 19117 is 71191.

It can be divided in two parts, 19 and 117, that added together give a triangular number (136 = T16).

It is a happy number.

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.

It is a de Polignac number, because none of the positive numbers 2k-19117 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 19094 and 19103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19157) 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, 1359 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (5464).

219117 is an apocalyptic number.

It is an amenable number.

19117 is a deficient number, since it is larger than the sum of its proper divisors (2739).

19117 is an equidigital number, since it uses as much as digits as its factorization.

19117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738.

The product of its digits is 63, while the sum is 19.

The square root of 19117 is about 138.2642397730. The cubic root of 19117 is about 26.7386768975.

The spelling of 19117 in words is "nineteen thousand, one hundred seventeen".

Divisors: 1 7 2731 19117