81166935 has 16 divisors (see below), whose sum is σ = 130156416. Its totient is φ = 43192608.

The previous prime is 81166927. The next prime is 81166951. The reversal of 81166935 is 53966118.

It is not a de Polignac number, because 81166935 - 2³ = 81166927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81166893 and 81166902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1212 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (8134776).

Almost surely, 2^81166935 is an apocalyptic number.

81166935 is a deficient number, since it is larger than the sum of its proper divisors (48989481).

81166935 is a wasteful number, since it uses less digits than its factorization.

81166935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12062.

The product of its digits is 38880, while the sum is 39.

The square root of 81166935 is about 9009.2693932416. The cubic root of 81166935 is about 432.9719040844.

It can be divided in two parts, 8116 and 6935, that added together give a palindrome (15051).

The spelling of 81166935 in words is "eighty-one million, one hundred sixty-six thousand, nine hundred thirty-five".