19814332981 has 8 divisors (see below), whose sum is σ = 20355727520. Its totient is φ = 19273247568.

The previous prime is 19814332973. The next prime is 19814332999. The reversal of 19814332981 is 18923341891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19814332981 - 2³ = 19814332973 is a prime.

It is a super-3 number, since 3×19814332981³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19814332481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55750 + ... + 206728.

It is an arithmetic number, because the mean of its divisors is an integer number (2544465940).

Almost surely, 2^19814332981 is an apocalyptic number.

It is an amenable number.

19814332981 is a deficient number, since it is larger than the sum of its proper divisors (541394539).

19814332981 is a wasteful number, since it uses less digits than its factorization.

19814332981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154563.

The product of its digits is 373248, while the sum is 49.

The spelling of 19814332981 in words is "nineteen billion, eight hundred fourteen million, three hundred thirty-two thousand, nine hundred eighty-one".