723316521 has 32 divisors (see below), whose sum is σ = 1034726400. Its totient is φ = 448439040.

The previous prime is 723316519. The next prime is 723316543. The reversal of 723316521 is 125613327.

It is not a de Polignac number, because 723316521 - 2¹ = 723316519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (723316421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 724995 + ... + 725991.

It is an arithmetic number, because the mean of its divisors is an integer number (32335200).

Almost surely, 2^723316521 is an apocalyptic number.

It is an amenable number.

723316521 is a deficient number, since it is larger than the sum of its proper divisors (311409879).

723316521 is a wasteful number, since it uses less digits than its factorization.

723316521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329.

The product of its digits is 7560, while the sum is 30.

The square root of 723316521 is about 26894.5444467833. The cubic root of 723316521 is about 897.6550151106.

Adding to 723316521 its reverse (125613327), we get a palindrome (848929848).

The spelling of 723316521 in words is "seven hundred twenty-three million, three hundred sixteen thousand, five hundred twenty-one".