19813096081 has 3 divisors (see below), whose sum is σ = 19813236841. Its totient is φ = 19812955322.

The previous prime is 19813096031. The next prime is 19813096087. The reversal of 19813096081 is 18069031891.

It is a happy number.

The square root of 19813096081 is 140759.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 19813096081 - 2¹⁵ = 19813063313 is a prime.

It is a super-3 number, since 3×19813096081³ (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 not an unprimeable number, because it can be changed into a prime (19813096087) 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 2 ways as a sum of consecutive naturals, for example, 70380 + ... + 211138.

Almost surely, 2^19813096081 is an apocalyptic number.

19813096081 is the 140759-th square number.

19813096081 is the 70380-th centered octagonal number.

It is an amenable number.

19813096081 is a deficient number, since it is larger than the sum of its proper divisors (140760).

19813096081 is an frugal number, since it uses more digits than its factorization.

19813096081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281518 (or 140759 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 19813096081 in words is "nineteen billion, eight hundred thirteen million, ninety-six thousand, eighty-one".