81412713 has 6 divisors (see below), whose sum is σ = 117596154. Its totient is φ = 54275136.

The previous prime is 81412703. The next prime is 81412729. The reversal of 81412713 is 31721418.

It can be written as a sum of positive squares in only one way, i.e., 59397849 + 22014864 = 7707^2 + 4692^2 .

It is not a de Polignac number, because 81412713 - 2⁶ = 81412649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81412703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4522920 + ... + 4522937.

It is an arithmetic number, because the mean of its divisors is an integer number (19599359).

Almost surely, 2^81412713 is an apocalyptic number.

It is an amenable number.

81412713 is a deficient number, since it is larger than the sum of its proper divisors (36183441).

81412713 is a wasteful number, since it uses less digits than its factorization.

81412713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045863 (or 9045860 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 81412713 is about 9022.8993677199. The cubic root of 81412713 is about 433.4084847306.

The spelling of 81412713 in words is "eighty-one million, four hundred twelve thousand, seven hundred thirteen".