42349661209 has 2 divisors, whose sum is σ = 42349661210. Its totient is φ = 42349661208.

The previous prime is 42349661141. The next prime is 42349661213. The reversal of 42349661209 is 90216694324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39235686400 + 3113974809 = 198080^2 + 55803^2 .

It is a cyclic number.

It is not a de Polignac number, because 42349661209 - 2¹¹ = 42349659161 is a prime.

It is not a weakly prime, because it can be changed into another prime (42349661309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21174830604 + 21174830605.

It is an arithmetic number, because the mean of its divisors is an integer number (21174830605).

Almost surely, 2^42349661209 is an apocalyptic number.

It is an amenable number.

42349661209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42349661209 is an equidigital number, since it uses as much as digits as its factorization.

42349661209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 42349661209 in words is "forty-two billion, three hundred forty-nine million, six hundred sixty-one thousand, two hundred nine".