724712161 has 4 divisors (see below), whose sum is σ = 724809924. Its totient is φ = 724614400.

The previous prime is 724712119. The next prime is 724712173. The reversal of 724712161 is 161217427.

724712161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161217427 = 7 ⋅23031061.

It can be written as a sum of positive squares in 2 ways, for example, as 354380625 + 370331536 = 18825^2 + 19244^2 .

It is a cyclic number.

It is not a de Polignac number, because 724712161 - 2¹⁹ = 724187873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724712101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36760 + ... + 52921.

It is an arithmetic number, because the mean of its divisors is an integer number (181202481).

Almost surely, 2^724712161 is an apocalyptic number.

It is an amenable number.

724712161 is a deficient number, since it is larger than the sum of its proper divisors (97763).

724712161 is an equidigital number, since it uses as much as digits as its factorization.

724712161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97762.

The product of its digits is 4704, while the sum is 31.

The square root of 724712161 is about 26920.4784690020. The cubic root of 724712161 is about 898.2319862843.

Adding to 724712161 its reverse (161217427), we get a palindrome (885929588).

The spelling of 724712161 in words is "seven hundred twenty-four million, seven hundred twelve thousand, one hundred sixty-one".