81854135 has 16 divisors (see below), whose sum is σ = 107360640. Its totient is φ = 59415840.

The previous prime is 81854107. The next prime is 81854197. The reversal of 81854135 is 53145818.

It is not a de Polignac number, because 81854135 - 2¹² = 81850039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81854095 and 81854104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36476 + ... + 38654.

It is an arithmetic number, because the mean of its divisors is an integer number (6710040).

Almost surely, 2^81854135 is an apocalyptic number.

81854135 is a deficient number, since it is larger than the sum of its proper divisors (25506505).

81854135 is a wasteful number, since it uses less digits than its factorization.

81854135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878.

The product of its digits is 19200, while the sum is 35.

The square root of 81854135 is about 9047.3275059545. The cubic root of 81854135 is about 434.1903908862.

The spelling of 81854135 in words is "eighty-one million, eight hundred fifty-four thousand, one hundred thirty-five".