12126505 has 4 divisors (see below), whose sum is σ = 14551812. Its totient is φ = 9701200.

The previous prime is 12126493. The next prime is 12126509. The reversal of 12126505 is 50562121.

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 8696601 + 3429904 = 2949^2 + 1852^2 .

It is not a de Polignac number, because 12126505 - 2¹³ = 12118313 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12126509) 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, 1212646 + ... + 1212655.

It is an arithmetic number, because the mean of its divisors is an integer number (3637953).

Almost surely, 2^12126505 is an apocalyptic number.

It is an amenable number.

12126505 is a deficient number, since it is larger than the sum of its proper divisors (2425307).

12126505 is an equidigital number, since it uses as much as digits as its factorization.

12126505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425306.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 12126505 is about 3482.3131679962. The cubic root of 12126505 is about 229.7445494059.

Adding to 12126505 its reverse (50562121), we get a palindrome (62688626).

The spelling of 12126505 in words is "twelve million, one hundred twenty-six thousand, five hundred five".