81235713 has 16 divisors (see below), whose sum is σ = 118561856. Its totient is φ = 49170240.

The previous prime is 81235709. The next prime is 81235723. The reversal of 81235713 is 31753218.

It is not a de Polignac number, because 81235713 - 2² = 81235709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81235723) 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 15 ways as a sum of consecutive naturals, for example, 14695 + ... + 19452.

It is an arithmetic number, because the mean of its divisors is an integer number (7410116).

Almost surely, 2^81235713 is an apocalyptic number.

It is an amenable number.

81235713 is a deficient number, since it is larger than the sum of its proper divisors (37326143).

81235713 is a wasteful number, since it uses less digits than its factorization.

81235713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34224.

The product of its digits is 5040, while the sum is 30.

The square root of 81235713 is about 9013.0856536483. The cubic root of 81235713 is about 433.0941646016.

The spelling of 81235713 in words is "eighty-one million, two hundred thirty-five thousand, seven hundred thirteen".