81140713 has 2 divisors, whose sum is σ = 81140714. Its totient is φ = 81140712.

The previous prime is 81140701. The next prime is 81140723. The reversal of 81140713 is 31704118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80766169 + 374544 = 8987^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 81140713 - 2¹³ = 81132521 is a prime.

It is a super-3 number, since 3×81140713³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (81140723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40570356 + 40570357.

It is an arithmetic number, because the mean of its divisors is an integer number (40570357).

Almost surely, 2^81140713 is an apocalyptic number.

It is an amenable number.

81140713 is a deficient number, since it is larger than the sum of its proper divisors (1).

81140713 is an equidigital number, since it uses as much as digits as its factorization.

81140713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 81140713 is about 9007.8139967475. The cubic root of 81140713 is about 432.9252733880.

The spelling of 81140713 in words is "eighty-one million, one hundred forty thousand, seven hundred thirteen".