1981717286919 has 16 divisors (see below), whose sum is σ = 2704924045824. Its totient is φ = 1289854641600.

The previous prime is 1981717286741. The next prime is 1981717286947. The reversal of 1981717286919 is 9196827171891.

It is not a de Polignac number, because 1981717286919 - 2⁹ = 1981717286407 is a prime.

It is a super-2 number, since 2×1981717286919² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981717286959) 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, 3073167 + ... + 3661664.

It is an arithmetic number, because the mean of its divisors is an integer number (169057752864).

Almost surely, 2^{1981717286919} is an apocalyptic number.

1981717286919 is a deficient number, since it is larger than the sum of its proper divisors (723206758905).

1981717286919 is a wasteful number, since it uses less digits than its factorization.

1981717286919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737158.

The product of its digits is 27433728, while the sum is 69.

The spelling of 1981717286919 in words is "one trillion, nine hundred eighty-one billion, seven hundred seventeen million, two hundred eighty-six thousand, nine hundred nineteen".