42249937909 has 2 divisors, whose sum is σ = 42249937910. Its totient is φ = 42249937908.

The previous prime is 42249937907. The next prime is 42249937999. The reversal of 42249937909 is 90973994224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39951214884 + 2298723025 = 199878^2 + 47945^2 .

It is a cyclic number.

It is not a de Polignac number, because 42249937909 - 2¹ = 42249937907 is a prime.

Together with 42249937907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42249937901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21124968954 + 21124968955.

It is an arithmetic number, because the mean of its divisors is an integer number (21124968955).

Almost surely, 2^42249937909 is an apocalyptic number.

It is an amenable number.

42249937909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42249937909 is an equidigital number, since it uses as much as digits as its factorization.

42249937909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 58.

The spelling of 42249937909 in words is "forty-two billion, two hundred forty-nine million, nine hundred thirty-seven thousand, nine hundred nine".