723434561 has 2 divisors, whose sum is σ = 723434562. Its totient is φ = 723434560.

The previous prime is 723434527. The next prime is 723434641. The reversal of 723434561 is 165434327.

723434561 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., 722588161 + 846400 = 26881^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 723434561 - 2¹⁰ = 723433537 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (723034561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361717280 + 361717281.

It is an arithmetic number, because the mean of its divisors is an integer number (361717281).

Almost surely, 2^723434561 is an apocalyptic number.

It is an amenable number.

723434561 is a deficient number, since it is larger than the sum of its proper divisors (1).

723434561 is an equidigital number, since it uses as much as digits as its factorization.

723434561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 35.

The square root of 723434561 is about 26896.7388543667. The cubic root of 723434561 is about 897.7038427131.

Adding to 723434561 its reverse (165434327), we get a palindrome (888868888).

The spelling of 723434561 in words is "seven hundred twenty-three million, four hundred thirty-four thousand, five hundred sixty-one".