81094939 has 4 divisors (see below), whose sum is σ = 81152280. Its totient is φ = 81037600.

The previous prime is 81094927. The next prime is 81094943. The reversal of 81094939 is 93949018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81094939 - 2⁹ = 81094427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81094895 and 81094904.

It is not an unprimeable number, because it can be changed into a prime (81094919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26494 + ... + 29395.

It is an arithmetic number, because the mean of its divisors is an integer number (20288070).

Almost surely, 2^81094939 is an apocalyptic number.

81094939 is a deficient number, since it is larger than the sum of its proper divisors (57341).

81094939 is a wasteful number, since it uses less digits than its factorization.

81094939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57340.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 81094939 is about 9005.2728442841. The cubic root of 81094939 is about 432.8438492039.

The spelling of 81094939 in words is "eighty-one million, ninety-four thousand, nine hundred thirty-nine".