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12131705 = 52426341
BaseRepresentation
bin101110010001…
…110101111001
3211211100120102
4232101311321
511101203310
61112005145
7205055255
oct56216571
924740512
1012131705
116936803
1240907b5
132689c31
14187b265
1510e98a5
hexb91d79

12131705 has 4 divisors (see below), whose sum is σ = 14558052. Its totient is φ = 9705360.

The previous prime is 12131701. The next prime is 12131711. The reversal of 12131705 is 50713121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50713121 = 59398539.

It can be written as a sum of positive squares in 2 ways, for example, as 1530169 + 10601536 = 1237^2 + 3256^2 .

It is not a de Polignac number, because 12131705 - 22 = 12131701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131701) 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, 1213166 + ... + 1213175.

It is an arithmetic number, because the mean of its divisors is an integer number (3639513).

Almost surely, 212131705 is an apocalyptic number.

It is an amenable number.

12131705 is a deficient number, since it is larger than the sum of its proper divisors (2426347).

12131705 is an equidigital number, since it uses as much as digits as its factorization.

12131705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426346.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 12131705 is about 3483.0597181214. The cubic root of 12131705 is about 229.7773838440. Note that the first 3 decimals are identical.

Adding to 12131705 its reverse (50713121), we get a palindrome (62844826).

The spelling of 12131705 in words is "twelve million, one hundred thirty-one thousand, seven hundred five".

Divisors: 1 5 2426341 12131705