81317074 has 8 divisors (see below), whose sum is σ = 128395440. Its totient is φ = 38518596.

The previous prime is 81317057. The next prime is 81317077. The reversal of 81317074 is 47071318.

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

It is a super-2 number, since 2×81317074² = 13224933047842952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81317077) 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, 1069924 + ... + 1069999.

It is an arithmetic number, because the mean of its divisors is an integer number (16049430).

Almost surely, 2^81317074 is an apocalyptic number.

81317074 is a deficient number, since it is larger than the sum of its proper divisors (47078366).

81317074 is a wasteful number, since it uses less digits than its factorization.

81317074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139944.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 81317074 is about 9017.5980172106. The cubic root of 81317074 is about 433.2387037285.

The spelling of 81317074 in words is "eighty-one million, three hundred seventeen thousand, seventy-four".