81166934 has 4 divisors (see below), whose sum is σ = 121750404. Its totient is φ = 40583466.

The previous prime is 81166927. The next prime is 81166951. The reversal of 81166934 is 43966118.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20291732 + ... + 20291735.

It is an arithmetic number, because the mean of its divisors is an integer number (30437601).

Almost surely, 2^81166934 is an apocalyptic number.

81166934 is a deficient number, since it is larger than the sum of its proper divisors (40583470).

81166934 is a wasteful number, since it uses less digits than its factorization.

81166934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40583469.

The product of its digits is 31104, while the sum is 38.

The square root of 81166934 is about 9009.2693377432. The cubic root of 81166934 is about 432.9719023062.

The spelling of 81166934 in words is "eighty-one million, one hundred sixty-six thousand, nine hundred thirty-four".