81484387 has 4 divisors (see below), whose sum is σ = 81505240. Its totient is φ = 81463536.

The previous prime is 81484379. The next prime is 81484391. The reversal of 81484387 is 78348418.

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 81484387 - 2³ = 81484379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81484327) 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, 2613 + ... + 13030.

It is an arithmetic number, because the mean of its divisors is an integer number (20376310).

Almost surely, 2^81484387 is an apocalyptic number.

81484387 is a deficient number, since it is larger than the sum of its proper divisors (20853).

81484387 is a wasteful number, since it uses less digits than its factorization.

81484387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20852.

The product of its digits is 172032, while the sum is 43.

The square root of 81484387 is about 9026.8702771226. The cubic root of 81484387 is about 433.5356352578.

The spelling of 81484387 in words is "eighty-one million, four hundred eighty-four thousand, three hundred eighty-seven".