81543231926 has 16 divisors (see below), whose sum is σ = 131856643968. Its totient is φ = 37597348800.

The previous prime is 81543231919. The next prime is 81543231929. The reversal of 81543231926 is 62913234518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81543231929) 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 7 ways as a sum of consecutive naturals, for example, 1556615 + ... + 1608146.

It is an arithmetic number, because the mean of its divisors is an integer number (8241040248).

Almost surely, 2^81543231926 is an apocalyptic number.

81543231926 is a deficient number, since it is larger than the sum of its proper divisors (50313412042).

81543231926 is a wasteful number, since it uses less digits than its factorization.

81543231926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165767.

The product of its digits is 311040, while the sum is 44.

The spelling of 81543231926 in words is "eighty-one billion, five hundred forty-three million, two hundred thirty-one thousand, nine hundred twenty-six".