81074443 has 4 divisors (see below), whose sum is σ = 81910360. Its totient is φ = 80238528.

The previous prime is 81074431. The next prime is 81074453. The reversal of 81074443 is 34447018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81074443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81074423) 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, 417813 + ... + 418006.

It is an arithmetic number, because the mean of its divisors is an integer number (20477590).

Almost surely, 2^81074443 is an apocalyptic number.

81074443 is a deficient number, since it is larger than the sum of its proper divisors (835917).

81074443 is an equidigital number, since it uses as much as digits as its factorization.

81074443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835916.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 81074443 is about 9004.1347724254. The cubic root of 81074443 is about 432.8073803641.

The spelling of 81074443 in words is "eighty-one million, seventy-four thousand, four hundred forty-three".