19381481873 has 8 divisors (see below), whose sum is σ = 22100151528. Its totient is φ = 16838210304.

The previous prime is 19381481863. The next prime is 19381481879. The reversal of 19381481873 is 37818418391.

It can be written as a sum of positive squares in 4 ways, for example, as 97160449 + 19284321424 = 9857^2 + 138868^2 .

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 19381481873 - 2⁸ = 19381481617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19381481879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43849286 + ... + 43849727.

It is an arithmetic number, because the mean of its divisors is an integer number (2762518941).

Almost surely, 2^19381481873 is an apocalyptic number.

19381481873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19381481873 is a deficient number, since it is larger than the sum of its proper divisors (2718669655).

19381481873 is a wasteful number, since it uses less digits than its factorization.

19381481873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87699043.

The product of its digits is 1161216, while the sum is 53.

The spelling of 19381481873 in words is "nineteen billion, three hundred eighty-one million, four hundred eighty-one thousand, eight hundred seventy-three".