2042021609 has 2 divisors, whose sum is σ = 2042021610. Its totient is φ = 2042021608.

The previous prime is 2042021537. The next prime is 2042021633. The reversal of 2042021609 is 9061202402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1056250000 + 985771609 = 32500^2 + 31397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042021609 - 2²⁴ = 2025244393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2042021669) 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, 1021010804 + 1021010805.

It is an arithmetic number, because the mean of its divisors is an integer number (1021010805).

Almost surely, 2^2042021609 is an apocalyptic number.

It is an amenable number.

2042021609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042021609 is an equidigital number, since it uses as much as digits as its factorization.

2042021609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2042021609 is about 45188.7332086218. The cubic root of 2042021609 is about 1268.6839465915.

The spelling of 2042021609 in words is "two billion, forty-two million, twenty-one thousand, six hundred nine".