2042656909 has 4 divisors (see below), whose sum is σ = 2042760060. Its totient is φ = 2042553760.

The previous prime is 2042656897. The next prime is 2042656937. The reversal of 2042656909 is 9096562402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 579364900 + 1463292009 = 24070^2 + 38253^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042656909 - 2²¹ = 2040559757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042656969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11482 + ... + 64939.

It is an arithmetic number, because the mean of its divisors is an integer number (510690015).

Almost surely, 2^2042656909 is an apocalyptic number.

It is an amenable number.

2042656909 is a deficient number, since it is larger than the sum of its proper divisors (103151).

2042656909 is an equidigital number, since it uses as much as digits as its factorization.

2042656909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103150.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 2042656909 is about 45195.7620690259. The cubic root of 2042656909 is about 1268.8155010826.

The spelling of 2042656909 in words is "two billion, forty-two million, six hundred fifty-six thousand, nine hundred nine".