2101604539 has 2 divisors, whose sum is σ = 2101604540. Its totient is φ = 2101604538.

The previous prime is 2101604537. The next prime is 2101604563. The reversal of 2101604539 is 9354061012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101604539 - 2¹ = 2101604537 is a prime.

Together with 2101604537, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2101604539.

It is not a weakly prime, because it can be changed into another prime (2101604537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050802269 + 1050802270.

It is an arithmetic number, because the mean of its divisors is an integer number (1050802270).

Almost surely, 2^2101604539 is an apocalyptic number.

2101604539 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101604539 is an equidigital number, since it uses as much as digits as its factorization.

2101604539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2101604539 is about 45843.2605624862. The cubic root of 2101604539 is about 1280.9052310376.

The spelling of 2101604539 in words is "two billion, one hundred one million, six hundred four thousand, five hundred thirty-nine".