81854895 has 8 divisors (see below), whose sum is σ = 130967856. Its totient is φ = 43655936.

The previous prime is 81854891. The next prime is 81854909. The reversal of 81854895 is 59845818.

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 81854895 - 2² = 81854891 is a prime.

It is a super-2 number, since 2×81854895² = 13400447670922050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81854891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2728482 + ... + 2728511.

It is an arithmetic number, because the mean of its divisors is an integer number (16370982).

Almost surely, 2^81854895 is an apocalyptic number.

81854895 is a deficient number, since it is larger than the sum of its proper divisors (49112961).

81854895 is a wasteful number, since it uses less digits than its factorization.

81854895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5457001.

The product of its digits is 460800, while the sum is 48.

The square root of 81854895 is about 9047.3695072104. The cubic root of 81854895 is about 434.1917346737.

The spelling of 81854895 in words is "eighty-one million, eight hundred fifty-four thousand, eight hundred ninety-five".