81222232969 has 4 divisors (see below), whose sum is σ = 81538273044. Its totient is φ = 80906192896.

The previous prime is 81222232939. The next prime is 81222232979. The reversal of 81222232969 is 96923222218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79983192969 + 1239040000 = 282813^2 + 35200^2 .

It is a cyclic number.

It is not a de Polignac number, because 81222232969 - 2⁹ = 81222232457 is a prime.

It is a super-2 number, since 2×81222232969² (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 (81222232939) 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 3 ways as a sum of consecutive naturals, for example, 158019652 + ... + 158020165.

It is an arithmetic number, because the mean of its divisors is an integer number (20384568261).

Almost surely, 2^81222232969 is an apocalyptic number.

It is an amenable number.

81222232969 is a deficient number, since it is larger than the sum of its proper divisors (316040075).

81222232969 is a wasteful number, since it uses less digits than its factorization.

81222232969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316040074.

The product of its digits is 373248, while the sum is 46.

The spelling of 81222232969 in words is "eighty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, nine hundred sixty-nine".