81914171 has 8 divisors (see below), whose sum is σ = 83116800. Its totient is φ = 80719848.

The previous prime is 81914167. The next prime is 81914197. The reversal of 81914171 is 17141918.

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

It is a cyclic number.

It is not a de Polignac number, because 81914171 - 2² = 81914167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81914141) 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, 19370 + ... + 23216.

It is an arithmetic number, because the mean of its divisors is an integer number (10389600).

Almost surely, 2^81914171 is an apocalyptic number.

81914171 is a deficient number, since it is larger than the sum of its proper divisors (1202629).

81914171 is a wasteful number, since it uses less digits than its factorization.

81914171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153.

The product of its digits is 2016, while the sum is 32.

The square root of 81914171 is about 9050.6447836604. The cubic root of 81914171 is about 434.2965174081.

The spelling of 81914171 in words is "eighty-one million, nine hundred fourteen thousand, one hundred seventy-one".