39942886091 has 2 divisors, whose sum is σ = 39942886092. Its totient is φ = 39942886090.

The previous prime is 39942886069. The next prime is 39942886121. The reversal of 39942886091 is 19068824993.

It is a weak prime.

It is an emirp because it is prime and its reverse (19068824993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39942886091 - 2¹⁸ = 39942623947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39942886091.

It is not a weakly prime, because it can be changed into another prime (39942886031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19971443045 + 19971443046.

It is an arithmetic number, because the mean of its divisors is an integer number (19971443046).

Almost surely, 2^39942886091 is an apocalyptic number.

39942886091 is a deficient number, since it is larger than the sum of its proper divisors (1).

39942886091 is an equidigital number, since it uses as much as digits as its factorization.

39942886091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 39942886091 in words is "thirty-nine billion, nine hundred forty-two million, eight hundred eighty-six thousand, ninety-one".