2126609909 has 2 divisors, whose sum is σ = 2126609910. Its totient is φ = 2126609908.

The previous prime is 2126609887. The next prime is 2126609929. The reversal of 2126609909 is 9099066212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1914325009 + 212284900 = 43753^2 + 14570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126609909 - 2¹² = 2126605813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2126609909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2126609929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063304954 + 1063304955.

It is an arithmetic number, because the mean of its divisors is an integer number (1063304955).

Almost surely, 2^2126609909 is an apocalyptic number.

It is an amenable number.

2126609909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126609909 is an equidigital number, since it uses as much as digits as its factorization.

2126609909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 2126609909 is about 46115.1808952323. The cubic root of 2126609909 is about 1285.9653823439.

The spelling of 2126609909 in words is "two billion, one hundred twenty-six million, six hundred nine thousand, nine hundred nine".