81074047 has 8 divisors (see below), whose sum is σ = 82853280. Its totient is φ = 79304160.

The previous prime is 81074041. The next prime is 81074099. The reversal of 81074047 is 74047018.

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

It is a cyclic number.

It is not a de Polignac number, because 81074047 - 2³ = 81074039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16897 + ... + 21157.

It is an arithmetic number, because the mean of its divisors is an integer number (10356660).

Almost surely, 2^81074047 is an apocalyptic number.

81074047 is a deficient number, since it is larger than the sum of its proper divisors (1779233).

81074047 is a wasteful number, since it uses less digits than its factorization.

81074047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 81074047 is about 9004.1127825011. The cubic root of 81074047 is about 432.8066756948.

The spelling of 81074047 in words is "eighty-one million, seventy-four thousand, forty-seven".