81079201013 has 2 divisors, whose sum is σ = 81079201014. Its totient is φ = 81079201012.

The previous prime is 81079200919. The next prime is 81079201033. The reversal of 81079201013 is 31010297018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65539584049 + 15539616964 = 256007^2 + 124658^2 .

It is a cyclic number.

It is not a de Polignac number, because 81079201013 - 2¹⁰ = 81079199989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81079201033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539600506 + 40539600507.

It is an arithmetic number, because the mean of its divisors is an integer number (40539600507).

Almost surely, 2^81079201013 is an apocalyptic number.

It is an amenable number.

81079201013 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079201013 is an equidigital number, since it uses as much as digits as its factorization.

81079201013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 81079201013 in words is "eighty-one billion, seventy-nine million, two hundred one thousand, thirteen".