723187009 has 2 divisors, whose sum is σ = 723187010. Its totient is φ = 723187008.

The previous prime is 723186991. The next prime is 723187057. The reversal of 723187009 is 900781327.

723187009 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., 700766784 + 22420225 = 26472^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 723187009 - 2²³ = 714798401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (723187109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361593504 + 361593505.

It is an arithmetic number, because the mean of its divisors is an integer number (361593505).

Almost surely, 2^723187009 is an apocalyptic number.

It is an amenable number.

723187009 is a deficient number, since it is larger than the sum of its proper divisors (1).

723187009 is an equidigital number, since it uses as much as digits as its factorization.

723187009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 723187009 is about 26892.1365644309. The cubic root of 723187009 is about 897.6014359686.

The spelling of 723187009 in words is "seven hundred twenty-three million, one hundred eighty-seven thousand, nine".