81141013 has 2 divisors, whose sum is σ = 81141014. Its totient is φ = 81141012.

The previous prime is 81140999. The next prime is 81141029. The reversal of 81141013 is 31014118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58644964 + 22496049 = 7658^2 + 4743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81141013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81141113) 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 as a sum of consecutive naturals, namely, 40570506 + 40570507.

It is an arithmetic number, because the mean of its divisors is an integer number (40570507).

Almost surely, 2^81141013 is an apocalyptic number.

It is an amenable number.

81141013 is a deficient number, since it is larger than the sum of its proper divisors (1).

81141013 is an equidigital number, since it uses as much as digits as its factorization.

81141013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 81141013 is about 9007.8306489410. The cubic root of 81141013 is about 432.9258069361.

The spelling of 81141013 in words is "eighty-one million, one hundred forty-one thousand, thirteen".