81548869 has 8 divisors (see below), whose sum is σ = 85540032. Its totient is φ = 77594880.

The previous prime is 81548867. The next prime is 81548897. The reversal of 81548869 is 96884518.

81548869 is nontrivially palindromic in base 6.

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 81548869 - 2¹ = 81548867 is a prime.

It is a super-2 number, since 2×81548869² = 13300436070358322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81548867) 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, 4747 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (10692504).

Almost surely, 2^81548869 is an apocalyptic number.

It is an amenable number.

81548869 is a deficient number, since it is larger than the sum of its proper divisors (3991163).

81548869 is a wasteful number, since it uses less digits than its factorization.

81548869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18587.

The product of its digits is 552960, while the sum is 49.

The square root of 81548869 is about 9030.4412406039. The cubic root of 81548869 is about 433.6499633929.

The spelling of 81548869 in words is "eighty-one million, five hundred forty-eight thousand, eight hundred sixty-nine".