81854475 has 12 divisors (see below), whose sum is σ = 135332856. Its totient is φ = 43655680.

The previous prime is 81854449. The next prime is 81854537. The reversal of 81854475 is 57445818.

It is not a de Polignac number, because 81854475 - 2¹³ = 81846283 is a prime.

It is a super-3 number, since 3×81854475³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 545622 + ... + 545771.

It is an arithmetic number, because the mean of its divisors is an integer number (11277738).

Almost surely, 2^81854475 is an apocalyptic number.

81854475 is a deficient number, since it is larger than the sum of its proper divisors (53478381).

81854475 is a wasteful number, since it uses less digits than its factorization.

81854475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091406 (or 1091401 counting only the distinct ones).

The product of its digits is 179200, while the sum is 42.

The square root of 81854475 is about 9047.3462960141. The cubic root of 81854475 is about 434.1909920553.

The spelling of 81854475 in words is "eighty-one million, eight hundred fifty-four thousand, four hundred seventy-five".