81943941 has 8 divisors (see below), whose sum is σ = 115009120. Its totient is φ = 51754032.

The previous prime is 81943933. The next prime is 81943957. The reversal of 81943941 is 14934918.

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

It is not a de Polignac number, because 81943941 - 2³ = 81943933 is a prime.

It is a super-2 number, since 2×81943941² = 13429618933222962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81943941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81943931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718750 + ... + 718863.

It is an arithmetic number, because the mean of its divisors is an integer number (14376140).

Almost surely, 2^81943941 is an apocalyptic number.

It is an amenable number.

81943941 is a deficient number, since it is larger than the sum of its proper divisors (33065179).

81943941 is a wasteful number, since it uses less digits than its factorization.

81943941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437635.

The product of its digits is 31104, while the sum is 39.

The square root of 81943941 is about 9052.2892684668. The cubic root of 81943941 is about 434.3491230448.

The spelling of 81943941 in words is "eighty-one million, nine hundred forty-three thousand, nine hundred forty-one".