81323174 has 8 divisors (see below), whose sum is σ = 122762208. Its totient is φ = 40402440.

The previous prime is 81323171. The next prime is 81323219. The reversal of 81323174 is 47132318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81323174² = 13226917258868552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81323171) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 129182 + ... + 129809.

It is an arithmetic number, because the mean of its divisors is an integer number (15345276).

Almost surely, 2^81323174 is an apocalyptic number.

81323174 is a deficient number, since it is larger than the sum of its proper divisors (41439034).

81323174 is a wasteful number, since it uses less digits than its factorization.

81323174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259150.

The product of its digits is 4032, while the sum is 29.

The square root of 81323174 is about 9017.9362384084. The cubic root of 81323174 is about 433.2495365909.

The spelling of 81323174 in words is "eighty-one million, three hundred twenty-three thousand, one hundred seventy-four".