39959940191 has 2 divisors, whose sum is σ = 39959940192. Its totient is φ = 39959940190.

The previous prime is 39959940173. The next prime is 39959940197. The reversal of 39959940191 is 19104995993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39959940191 - 2⁶ = 39959940127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39959940191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39959940197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19979970095 + 19979970096.

It is an arithmetic number, because the mean of its divisors is an integer number (19979970096).

Almost surely, 2^39959940191 is an apocalyptic number.

39959940191 is a deficient number, since it is larger than the sum of its proper divisors (1).

39959940191 is an equidigital number, since it uses as much as digits as its factorization.

39959940191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3542940, while the sum is 59.

The spelling of 39959940191 in words is "thirty-nine billion, nine hundred fifty-nine million, nine hundred forty thousand, one hundred ninety-one".