80609729 has 2 divisors, whose sum is σ = 80609730. Its totient is φ = 80609728.

The previous prime is 80609719. The next prime is 80609797. The reversal of 80609729 is 92790608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 2729104 = 8825^2 + 1652^2 .

It is a cyclic number.

It is not a de Polignac number, because 80609729 - 2¹⁶ = 80544193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (80609719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40304864 + 40304865.

It is an arithmetic number, because the mean of its divisors is an integer number (40304865).

Almost surely, 2^80609729 is an apocalyptic number.

It is an amenable number.

80609729 is a deficient number, since it is larger than the sum of its proper divisors (1).

80609729 is an equidigital number, since it uses as much as digits as its factorization.

80609729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 80609729 is about 8978.2920981666. The cubic root of 80609729 is about 431.9788530601.

The spelling of 80609729 in words is "eighty million, six hundred nine thousand, seven hundred twenty-nine".