81194941 has 4 divisors (see below), whose sum is σ = 85971132. Its totient is φ = 76418752.

The previous prime is 81194933. The next prime is 81194951. The reversal of 81194941 is 14949118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14949118 = 2 ⋅7474559.

It can be written as a sum of positive squares in 2 ways, for example, as 29052100 + 52142841 = 5390^2 + 7221^2 .

It is a cyclic number.

It is not a de Polignac number, because 81194941 - 2³ = 81194933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81194941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81194951) 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 3 ways as a sum of consecutive naturals, for example, 2388070 + ... + 2388103.

It is an arithmetic number, because the mean of its divisors is an integer number (21492783).

Almost surely, 2^81194941 is an apocalyptic number.

It is an amenable number.

81194941 is a deficient number, since it is larger than the sum of its proper divisors (4776191).

81194941 is a wasteful number, since it uses less digits than its factorization.

81194941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776190.

The product of its digits is 10368, while the sum is 37.

The square root of 81194941 is about 9010.8235472680. The cubic root of 81194941 is about 433.0216961858.

The spelling of 81194941 in words is "eighty-one million, one hundred ninety-four thousand, nine hundred forty-one".