729655009 has 2 divisors, whose sum is σ = 729655010. Its totient is φ = 729655008.

The previous prime is 729654973. The next prime is 729655021. The reversal of 729655009 is 900556927.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375274384 + 354380625 = 19372^2 + 18825^2 .

It is a cyclic number.

It is not a de Polignac number, because 729655009 - 2¹⁵ = 729622241 is a prime.

It is not a weakly prime, because it can be changed into another prime (729655039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364827504 + 364827505.

It is an arithmetic number, because the mean of its divisors is an integer number (364827505).

Almost surely, 2^729655009 is an apocalyptic number.

It is an amenable number.

729655009 is a deficient number, since it is larger than the sum of its proper divisors (1).

729655009 is an equidigital number, since it uses as much as digits as its factorization.

729655009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 729655009 is about 27012.1270728538. The cubic root of 729655009 is about 900.2694703382.

The spelling of 729655009 in words is "seven hundred twenty-nine million, six hundred fifty-five thousand, nine".