19931081999 has 16 divisors (see below), whose sum is σ = 20743680000. Its totient is φ = 19129491360.

The previous prime is 19931081977. The next prime is 19931082007. The reversal of 19931081999 is 99918013991.

It is a cyclic number.

It is not a de Polignac number, because 19931081999 - 2¹⁶ = 19931016463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19931081969) 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 in 15 ways as a sum of consecutive naturals, for example, 3410522 + ... + 3416360.

It is an arithmetic number, because the mean of its divisors is an integer number (1296480000).

Almost surely, 2^19931081999 is an apocalyptic number.

19931081999 is a deficient number, since it is larger than the sum of its proper divisors (812598001).

19931081999 is a wasteful number, since it uses less digits than its factorization.

19931081999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758.

The product of its (nonzero) digits is 1417176, while the sum is 59.

The spelling of 19931081999 in words is "nineteen billion, nine hundred thirty-one million, eighty-one thousand, nine hundred ninety-nine".