81484393 has 4 divisors (see below), whose sum is σ = 81504388. Its totient is φ = 81464400.

The previous prime is 81484391. The next prime is 81484409. The reversal of 81484393 is 39348418.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27123264 + 54361129 = 5208^2 + 7373^2 .

It is a cyclic number.

It is not a de Polignac number, because 81484393 - 2¹ = 81484391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81484391) 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, 1446 + ... + 12847.

It is an arithmetic number, because the mean of its divisors is an integer number (20376097).

Almost surely, 2^81484393 is an apocalyptic number.

It is an amenable number.

81484393 is a deficient number, since it is larger than the sum of its proper divisors (19995).

81484393 is a wasteful number, since it uses less digits than its factorization.

81484393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19994.

The product of its digits is 82944, while the sum is 40.

The square root of 81484393 is about 9026.8706094637. The cubic root of 81484393 is about 433.5356458988.

The spelling of 81484393 in words is "eighty-one million, four hundred eighty-four thousand, three hundred ninety-three".