126165205 has 4 divisors (see below), whose sum is σ = 151398252.
Its totient is φ = 100932160.
The previous prime is 126165203. The next prime is 126165209. The reversal of 126165205 is 502561621.
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 41396356 + 84768849 = 6434^2 + 9207^2
It is not a de Polignac number, because 126165205 - 21 = 126165203 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (126165203) 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, 12616516 + ... + 12616525.
It is an arithmetic number, because the mean of its divisors is an integer number (37849563).
Almost surely, 2126165205 is an apocalyptic number.
It is an amenable number.
126165205 is a deficient number, since it is larger than the sum of its proper divisors (25233047).
126165205 is an equidigital number, since it uses as much as digits as its factorization.
126165205 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 25233046.
The product of its (nonzero) digits is 3600, while the sum is 28.
The square root of 126165205 is about 11232.3285653510.
The cubic root of 126165205 is about 501.5488041246.
It can be divided in two parts, 1261 and 65205, that added together give a palindrome (66466).
The spelling of 126165205 in words is "one hundred twenty-six million, one hundred sixty-five thousand, two hundred five".