81089943 has 16 divisors (see below), whose sum is σ = 119099136. Its totient is φ = 48666240.

The previous prime is 81089861. The next prime is 81089969. The reversal of 81089943 is 34998018.

It is not a de Polignac number, because 81089943 - 2¹⁰ = 81088919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81089895 and 81089904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81084943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8530 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (7443696).

Almost surely, 2^81089943 is an apocalyptic number.

81089943 is a deficient number, since it is larger than the sum of its proper divisors (38009193).

81089943 is a wasteful number, since it uses less digits than its factorization.

81089943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23974.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 81089943 is about 9004.9954469728. The cubic root of 81089943 is about 432.8349603127.

The spelling of 81089943 in words is "eighty-one million, eighty-nine thousand, nine hundred forty-three".