81108974 has 16 divisors (see below), whose sum is σ = 124703712. Its totient is φ = 39550368.

The previous prime is 81108961. The next prime is 81108977. The reversal of 81108974 is 47980118.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81108977) 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, 16127 + ... + 20549.

It is an arithmetic number, because the mean of its divisors is an integer number (7793982).

Almost surely, 2^81108974 is an apocalyptic number.

81108974 is a deficient number, since it is larger than the sum of its proper divisors (43594738).

81108974 is a wasteful number, since it uses less digits than its factorization.

81108974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4651.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81108974 is about 9006.0520762430. The cubic root of 81108974 is about 432.8688183453.

The spelling of 81108974 in words is "eighty-one million, one hundred eight thousand, nine hundred seventy-four".