81079389701 has 2 divisors, whose sum is σ = 81079389702. Its totient is φ = 81079389700.

The previous prime is 81079389691. The next prime is 81079389733. The reversal of 81079389701 is 10798397018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67833681601 + 13245708100 = 260449^2 + 115090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81079389701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81079389101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539694850 + 40539694851.

It is an arithmetic number, because the mean of its divisors is an integer number (40539694851).

Almost surely, 2^81079389701 is an apocalyptic number.

It is an amenable number.

81079389701 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079389701 is an equidigital number, since it uses as much as digits as its factorization.

81079389701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 81079389701 in words is "eighty-one billion, seventy-nine million, three hundred eighty-nine thousand, seven hundred one".