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12131111 = 97125063
BaseRepresentation
bin101110010001…
…101100100111
3211211022202102
4232101230213
511101143421
61112002315
7205053446
oct56215447
924738672
1012131111
116936313
12409039b
132689895
14187ad5d
1510e960b
hexb91b27

12131111 has 4 divisors (see below), whose sum is σ = 12256272. Its totient is φ = 12005952.

The previous prime is 12131099. The next prime is 12131113. The reversal of 12131111 is 11113121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11113121 = 17653713.

It is a cyclic number.

It is not a de Polignac number, because 12131111 - 210 = 12130087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12131092 and 12131101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62435 + ... + 62628.

It is an arithmetic number, because the mean of its divisors is an integer number (3064068).

Almost surely, 212131111 is an apocalyptic number.

12131111 is a deficient number, since it is larger than the sum of its proper divisors (125161).

12131111 is an equidigital number, since it uses as much as digits as its factorization.

12131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125160.

The product of its digits is 6, while the sum is 11.

The square root of 12131111 is about 3482.9744472218. The cubic root of 12131111 is about 229.7736336156.

Adding to 12131111 its reverse (11113121), we get a palindrome (23244232).

The spelling of 12131111 in words is "twelve million, one hundred thirty-one thousand, one hundred eleven".

Divisors: 1 97 125063 12131111