81471713 has 4 divisors (see below), whose sum is σ = 83366448. Its totient is φ = 79576980.

The previous prime is 81471707. The next prime is 81471739. The reversal of 81471713 is 31717418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81471713 - 2²⁰ = 80423137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81471713.

It is not an unprimeable number, because it can be changed into a prime (81471703) 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, 947303 + ... + 947388.

It is an arithmetic number, because the mean of its divisors is an integer number (20841612).

Almost surely, 2^81471713 is an apocalyptic number.

It is an amenable number.

81471713 is a deficient number, since it is larger than the sum of its proper divisors (1894735).

81471713 is a wasteful number, since it uses less digits than its factorization.

81471713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894734.

The product of its digits is 4704, while the sum is 32.

The square root of 81471713 is about 9026.1682346387. The cubic root of 81471713 is about 433.5131568594.

It can be divided in two parts, 814 and 71713, that added together give a palindrome (72527).

The spelling of 81471713 in words is "eighty-one million, four hundred seventy-one thousand, seven hundred thirteen".