81944943 has 8 divisors (see below), whose sum is σ = 111321648. Its totient is φ = 53599104.

The previous prime is 81944927. The next prime is 81944959. The reversal of 81944943 is 34944918.

It is an interprime number because it is at equal distance from previous prime (81944927) and next prime (81944959).

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

It is not a de Polignac number, because 81944943 - 2⁴ = 81944927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81944895 and 81944904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81944903) 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, 257530 + ... + 257847.

It is an arithmetic number, because the mean of its divisors is an integer number (13915206).

Almost surely, 2^81944943 is an apocalyptic number.

81944943 is a deficient number, since it is larger than the sum of its proper divisors (29376705).

81944943 is a wasteful number, since it uses less digits than its factorization.

81944943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515433.

The product of its digits is 124416, while the sum is 42.

The square root of 81944943 is about 9052.3446134137. The cubic root of 81944943 is about 434.3508934261.

The spelling of 81944943 in words is "eighty-one million, nine hundred forty-four thousand, nine hundred forty-three".