81471367 has 4 divisors (see below), whose sum is σ = 82311376. Its totient is φ = 80631360.

The previous prime is 81471349. The next prime is 81471391. The reversal of 81471367 is 76317418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81471367 - 2¹¹ = 81469319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81471307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419859 + ... + 420052.

It is an arithmetic number, because the mean of its divisors is an integer number (20577844).

Almost surely, 2^81471367 is an apocalyptic number.

81471367 is a deficient number, since it is larger than the sum of its proper divisors (840009).

81471367 is an equidigital number, since it uses as much as digits as its factorization.

81471367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840008.

The product of its digits is 28224, while the sum is 37.

The square root of 81471367 is about 9026.1490681242. The cubic root of 81471367 is about 433.5125431668.

The spelling of 81471367 in words is "eighty-one million, four hundred seventy-one thousand, three hundred sixty-seven".