81232223219 has 8 divisors (see below), whose sum is σ = 92838869760. Its totient is φ = 69626087496.

The previous prime is 81232223197. The next prime is 81232223227. The reversal of 81232223219 is 91232223218.

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

It is a de Polignac number, because none of the positive numbers 2^k-81232223219 is a prime.

It is a super-2 number, since 2×81232223219² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81232223279) 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, 315722 + ... + 512000.

It is an arithmetic number, because the mean of its divisors is an integer number (11604858720).

Almost surely, 2^81232223219 is an apocalyptic number.

81232223219 is a deficient number, since it is larger than the sum of its proper divisors (11606646541).

81232223219 is a wasteful number, since it uses less digits than its factorization.

81232223219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255409.

The product of its digits is 20736, while the sum is 35.

Subtracting 81232223219 from its reverse (91232223218), we obtain a palindrome (9999999999).

The spelling of 81232223219 in words is "eighty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, two hundred nineteen".