81875554 has 8 divisors (see below), whose sum is σ = 122881500. Its totient is φ = 40915056.

The previous prime is 81875543. The next prime is 81875597. The reversal of 81875554 is 45557818.

It can be written as a sum of positive squares in 2 ways, for example, as 65691025 + 16184529 = 8105^2 + 4023^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 81875554.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6429 + ... + 14320.

Almost surely, 2^81875554 is an apocalyptic number.

81875554 is a deficient number, since it is larger than the sum of its proper divisors (41005946).

81875554 is a wasteful number, since it uses less digits than its factorization.

81875554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22724.

The product of its digits is 224000, while the sum is 43.

The square root of 81875554 is about 9048.5111482497. The cubic root of 81875554 is about 434.2282595206.

The spelling of 81875554 in words is "eighty-one million, eight hundred seventy-five thousand, five hundred fifty-four".