81548363 has 8 divisors (see below), whose sum is σ = 91639968. Its totient is φ = 72002304.

The previous prime is 81548359. The next prime is 81548393. The reversal of 81548363 is 36384518.

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 81548363 - 2² = 81548359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81548393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136070 + ... + 136667.

It is an arithmetic number, because the mean of its divisors is an integer number (11454996).

Almost surely, 2^81548363 is an apocalyptic number.

81548363 is a deficient number, since it is larger than the sum of its proper divisors (10091605).

81548363 is a wasteful number, since it uses less digits than its factorization.

81548363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272773.

The product of its digits is 69120, while the sum is 38.

The square root of 81548363 is about 9030.4132242107. The cubic root of 81548363 is about 433.6490664774.

The spelling of 81548363 in words is "eighty-one million, five hundred forty-eight thousand, three hundred sixty-three".