2042042909 has 2 divisors, whose sum is σ = 2042042910. Its totient is φ = 2042042908.

The previous prime is 2042042903. The next prime is 2042042921. The reversal of 2042042909 is 9092402402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142642809 + 899400100 = 33803^2 + 29990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042042909 - 2²⁸ = 1773607453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2042042903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021021454 + 1021021455.

It is an arithmetic number, because the mean of its divisors is an integer number (1021021455).

Almost surely, 2^2042042909 is an apocalyptic number.

It is an amenable number.

2042042909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042042909 is an equidigital number, since it uses as much as digits as its factorization.

2042042909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2042042909 is about 45188.9688862227. The cubic root of 2042042909 is about 1268.6883577225.

The spelling of 2042042909 in words is "two billion, forty-two million, forty-two thousand, nine hundred nine".