80581729 has 2 divisors, whose sum is σ = 80581730. Its totient is φ = 80581728.

The previous prime is 80581727. The next prime is 80581759. The reversal of 80581729 is 92718508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51151104 + 29430625 = 7152^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 80581729 - 2¹ = 80581727 is a prime.

Together with 80581727, 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 = 80581691 and 80581700.

It is not a weakly prime, because it can be changed into another prime (80581727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40290864 + 40290865.

It is an arithmetic number, because the mean of its divisors is an integer number (40290865).

Almost surely, 2^80581729 is an apocalyptic number.

It is an amenable number.

80581729 is a deficient number, since it is larger than the sum of its proper divisors (1).

80581729 is an equidigital number, since it uses as much as digits as its factorization.

80581729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 80581729 is about 8976.7326461246. The cubic root of 80581729 is about 431.9288309401.

The spelling of 80581729 in words is "eighty million, five hundred eighty-one thousand, seven hundred twenty-nine".