2542243309 has 2 divisors, whose sum is σ = 2542243310. Its totient is φ = 2542243308.

The previous prime is 2542243273. The next prime is 2542243331. The reversal of 2542243309 is 9033422452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440202500 + 1102040809 = 37950^2 + 33197^2 .

It is a cyclic number.

It is not a de Polignac number, because 2542243309 - 2⁷ = 2542243181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2542243349) 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, 1271121654 + 1271121655.

It is an arithmetic number, because the mean of its divisors is an integer number (1271121655).

Almost surely, 2^2542243309 is an apocalyptic number.

It is an amenable number.

2542243309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2542243309 is an equidigital number, since it uses as much as digits as its factorization.

2542243309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 2542243309 is about 50420.6635120959. The cubic root of 2542243309 is about 1364.8105501719.

The spelling of 2542243309 in words is "two billion, five hundred forty-two million, two hundred forty-three thousand, three hundred nine".