17949981931939 has 2 divisors, whose sum is σ = 17949981931940. Its totient is φ = 17949981931938.

The previous prime is 17949981931867. The next prime is 17949981931949. The reversal of 17949981931939 is 93913918994971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17949981931939 - 2¹⁷ = 17949981800867 is a prime.

It is not a weakly prime, because it can be changed into another prime (17949981931949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8974990965969 + 8974990965970.

It is an arithmetic number, because the mean of its divisors is an integer number (8974990965970).

Almost surely, 2^{17949981931939} is an apocalyptic number.

17949981931939 is a deficient number, since it is larger than the sum of its proper divisors (1).

17949981931939 is an equidigital number, since it uses as much as digits as its factorization.

17949981931939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071385056, while the sum is 82.

The spelling of 17949981931939 in words is "seventeen trillion, nine hundred forty-nine billion, nine hundred eighty-one million, nine hundred thirty-one thousand, nine hundred thirty-nine".