81301563219 has 4 divisors (see below), whose sum is σ = 108402084296. Its totient is φ = 54201042144.

The previous prime is 81301563193. The next prime is 81301563221. The reversal of 81301563219 is 91236510318.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81301563219 - 2¹² = 81301559123 is a prime.

It is a super-2 number, since 2×81301563219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81301563269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13550260534 + ... + 13550260539.

It is an arithmetic number, because the mean of its divisors is an integer number (27100521074).

Almost surely, 2^81301563219 is an apocalyptic number.

81301563219 is a deficient number, since it is larger than the sum of its proper divisors (27100521077).

81301563219 is a wasteful number, since it uses less digits than its factorization.

81301563219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27100521076.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 81301563219 in words is "eighty-one billion, three hundred one million, five hundred sixty-three thousand, two hundred nineteen".