731648909 has 2 divisors, whose sum is σ = 731648910. Its totient is φ = 731648908.

The previous prime is 731648899. The next prime is 731648923. The reversal of 731648909 is 909846137.

731648909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491863684 + 239785225 = 22178^2 + 15485^2 .

It is a cyclic number.

It is not a de Polignac number, because 731648909 - 2¹² = 731644813 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731648609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365824454 + 365824455.

It is an arithmetic number, because the mean of its divisors is an integer number (365824455).

Almost surely, 2^731648909 is an apocalyptic number.

It is an amenable number.

731648909 is a deficient number, since it is larger than the sum of its proper divisors (1).

731648909 is an equidigital number, since it uses as much as digits as its factorization.

731648909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 731648909 is about 27049.0093903640. The cubic root of 731648909 is about 901.0887683476.

The spelling of 731648909 in words is "seven hundred thirty-one million, six hundred forty-eight thousand, nine hundred nine".