81855092 has 12 divisors (see below), whose sum is σ = 156268896. Its totient is φ = 37206840.

The previous prime is 81855079. The next prime is 81855113. The reversal of 81855092 is 29055818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930128 + ... + 930215.

It is an arithmetic number, because the mean of its divisors is an integer number (13022408).

Almost surely, 2^81855092 is an apocalyptic number.

It is an amenable number.

81855092 is a deficient number, since it is larger than the sum of its proper divisors (74413804).

81855092 is a wasteful number, since it uses less digits than its factorization.

81855092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860358 (or 1860356 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 81855092 is about 9047.3803943462. The cubic root of 81855092 is about 434.1920829962.

The spelling of 81855092 in words is "eighty-one million, eight hundred fifty-five thousand, ninety-two".