81232277193 has 8 divisors (see below), whose sum is σ = 120344114400. Its totient is φ = 54154851444.

The previous prime is 81232277183. The next prime is 81232277201. The reversal of 81232277193 is 39177223218.

It is not a de Polignac number, because 81232277193 - 2¹² = 81232273097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81232277183) 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 7 ways as a sum of consecutive naturals, for example, 1504301403 + ... + 1504301456.

It is an arithmetic number, because the mean of its divisors is an integer number (15043014300).

Almost surely, 2^81232277193 is an apocalyptic number.

It is an amenable number.

81232277193 is a deficient number, since it is larger than the sum of its proper divisors (39111837207).

81232277193 is a wasteful number, since it uses less digits than its factorization.

81232277193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008602868 (or 3008602862 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 81232277193 in words is "eighty-one billion, two hundred thirty-two million, two hundred seventy-seven thousand, one hundred ninety-three".