81679271 has 8 divisors (see below), whose sum is σ = 91036080. Its totient is φ = 72828288.

The previous prime is 81679261. The next prime is 81679277. The reversal of 81679271 is 17297618.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81679271 is a prime.

It is a super-2 number, since 2×81679271² = 13343006622182882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81679277) 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, 126116 + ... + 126761.

It is an arithmetic number, because the mean of its divisors is an integer number (11379510).

Almost surely, 2^81679271 is an apocalyptic number.

81679271 is a deficient number, since it is larger than the sum of its proper divisors (9356809).

81679271 is a wasteful number, since it uses less digits than its factorization.

81679271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252913.

The product of its digits is 42336, while the sum is 41.

The square root of 81679271 is about 9037.6584910031. The cubic root of 81679271 is about 433.8809852256.

The spelling of 81679271 in words is "eighty-one million, six hundred seventy-nine thousand, two hundred seventy-one".