42991960393 has 2 divisors, whose sum is σ = 42991960394. Its totient is φ = 42991960392.

The previous prime is 42991960391. The next prime is 42991960481. The reversal of 42991960393 is 39306919924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26111974464 + 16879985929 = 161592^2 + 129923^2 .

It is a cyclic number.

It is not a de Polignac number, because 42991960393 - 2¹ = 42991960391 is a prime.

Together with 42991960391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42991960391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21495980196 + 21495980197.

It is an arithmetic number, because the mean of its divisors is an integer number (21495980197).

Almost surely, 2^42991960393 is an apocalyptic number.

It is an amenable number.

42991960393 is a deficient number, since it is larger than the sum of its proper divisors (1).

42991960393 is an equidigital number, since it uses as much as digits as its factorization.

42991960393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 55.

The spelling of 42991960393 in words is "forty-two billion, nine hundred ninety-one million, nine hundred sixty thousand, three hundred ninety-three".