42994437193 has 2 divisors, whose sum is σ = 42994437194. Its totient is φ = 42994437192.

The previous prime is 42994437191. The next prime is 42994437203. The reversal of 42994437193 is 39173449924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23776714809 + 19217722384 = 154197^2 + 138628^2 .

It is a cyclic number.

It is not a de Polignac number, because 42994437193 - 2¹ = 42994437191 is a prime.

Together with 42994437191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42994437191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21497218596 + 21497218597.

It is an arithmetic number, because the mean of its divisors is an integer number (21497218597).

Almost surely, 2^42994437193 is an apocalyptic number.

It is an amenable number.

42994437193 is a deficient number, since it is larger than the sum of its proper divisors (1).

42994437193 is an equidigital number, since it uses as much as digits as its factorization.

42994437193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 55.

The spelling of 42994437193 in words is "forty-two billion, nine hundred ninety-four million, four hundred thirty-seven thousand, one hundred ninety-three".