723161 has 2 divisors, whose sum is σ = 723162. Its totient is φ = 723160.

The previous prime is 723157. The next prime is 723167. The reversal of 723161 is 161327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 175561 = 740^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 723161 - 2² = 723157 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 (723167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361580 + 361581.

It is an arithmetic number, because the mean of its divisors is an integer number (361581).

2⁷²³¹⁶¹ is an apocalyptic number.

It is an amenable number.

723161 is a deficient number, since it is larger than the sum of its proper divisors (1).

723161 is an equidigital number, since it uses as much as digits as its factorization.

723161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 723161 is about 850.3887346385. The cubic root of 723161 is about 89.7590675269.

Adding to 723161 its reverse (161327), we get a palindrome (884488).

It can be divided in two parts, 723 and 161, that multiplied together give a triangular number (116403 = T₄₈₂).

The spelling of 723161 in words is "seven hundred twenty-three thousand, one hundred sixty-one".