2102444909 has 2 divisors, whose sum is σ = 2102444910. Its totient is φ = 2102444908.

The previous prime is 2102444887. The next prime is 2102444941. The reversal of 2102444909 is 9094442012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1343442409 + 759002500 = 36653^2 + 27550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102444909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102444989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051222454 + 1051222455.

It is an arithmetic number, because the mean of its divisors is an integer number (1051222455).

Almost surely, 2^2102444909 is an apocalyptic number.

It is an amenable number.

2102444909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102444909 is an equidigital number, since it uses as much as digits as its factorization.

2102444909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2102444909 is about 45852.4253338905. The cubic root of 2102444909 is about 1281.0759404270.

The spelling of 2102444909 in words is "two billion, one hundred two million, four hundred forty-four thousand, nine hundred nine".