724541 has 4 divisors (see below), whose sum is σ = 726684. Its totient is φ = 722400.

The previous prime is 724531. The next prime is 724547. The reversal of 724541 is 145427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145427 = 41 ⋅3547.

It can be written as a sum of positive squares in 2 ways, for example, as 198916 + 525625 = 446^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (181671).

2⁷²⁴⁵⁴¹ is an apocalyptic number.

It is an amenable number.

724541 is a deficient number, since it is larger than the sum of its proper divisors (2143).

724541 is a wasteful number, since it uses less digits than its factorization.

724541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142.

The product of its digits is 1120, while the sum is 23.

The square root of 724541 is about 851.1997415413. The cubic root of 724541 is about 89.8161266534.

Adding to 724541 its reverse (145427), we get a palindrome (869968).

The spelling of 724541 in words is "seven hundred twenty-four thousand, five hundred forty-one".