126321609 has 16 divisors (see below), whose sum is σ = 172456704. Its totient is φ = 82224000.

The previous prime is 126321607. The next prime is 126321619. The reversal of 126321609 is 906123621.

It is not a de Polignac number, because 126321609 - 2¹ = 126321607 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126321607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19264 + ... + 24974.

It is an arithmetic number, because the mean of its divisors is an integer number (10778544).

Almost surely, 2^126321609 is an apocalyptic number.

It is an amenable number.

126321609 is a deficient number, since it is larger than the sum of its proper divisors (46135095).

126321609 is a wasteful number, since it uses less digits than its factorization.

126321609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 126321609 is about 11239.2886340729. The cubic root of 126321609 is about 501.7559712441.

It can be divided in two parts, 12632 and 1609, that added together give a palindrome (14241).

The spelling of 126321609 in words is "one hundred twenty-six million, three hundred twenty-one thousand, six hundred nine".