81713741 has 2 divisors, whose sum is σ = 81713742. Its totient is φ = 81713740.

The previous prime is 81713689. The next prime is 81713743. The reversal of 81713741 is 14731718.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76492516 + 5221225 = 8746^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 81713741 - 2¹⁰ = 81712717 is a prime.

Together with 81713743, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81713698 and 81713707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81713743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40856870 + 40856871.

It is an arithmetic number, because the mean of its divisors is an integer number (40856871).

Almost surely, 2^81713741 is an apocalyptic number.

It is an amenable number.

81713741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81713741 is an equidigital number, since it uses as much as digits as its factorization.

81713741 is an evil number, because the sum of its binary digits is even.

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

The square root of 81713741 is about 9039.5653103454. The cubic root of 81713741 is about 433.9420116199.

The spelling of 81713741 in words is "eighty-one million, seven hundred thirteen thousand, seven hundred forty-one".