81174093 has 32 divisors (see below), whose sum is σ = 145324032. Its totient is φ = 38923200.

The previous prime is 81174059. The next prime is 81174097. The reversal of 81174093 is 39047118.

It is not a de Polignac number, because 81174093 - 2¹⁰ = 81173069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81174097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10513 + ... + 16518.

It is an arithmetic number, because the mean of its divisors is an integer number (4541376).

Almost surely, 2^81174093 is an apocalyptic number.

It is an amenable number.

81174093 is a deficient number, since it is larger than the sum of its proper divisors (64149939).

81174093 is a wasteful number, since it uses less digits than its factorization.

81174093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27065.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81174093 is about 9009.6666420018. Note that the first 4 decimals coincide. The cubic root of 81174093 is about 432.9846314418.

The spelling of 81174093 in words is "eighty-one million, one hundred seventy-four thousand, ninety-three".