81713842 has 16 divisors (see below), whose sum is σ = 140368320. Its totient is φ = 34948368.

The previous prime is 81713833. The next prime is 81713843. The reversal of 81713842 is 24831718.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81713798 and 81713807.

It is not an unprimeable number, because it can be changed into a prime (81713843) 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, 1393 + ... + 12859.

It is an arithmetic number, because the mean of its divisors is an integer number (8773020).

Almost surely, 2^81713842 is an apocalyptic number.

81713842 is a deficient number, since it is larger than the sum of its proper divisors (58654478).

81713842 is a wasteful number, since it uses less digits than its factorization.

81713842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11985.

The product of its digits is 10752, while the sum is 34.

The square root of 81713842 is about 9039.5708968955. The cubic root of 81713842 is about 433.9421904071.

The spelling of 81713842 in words is "eighty-one million, seven hundred thirteen thousand, eight hundred forty-two".