723016321 has 4 divisors (see below), whose sum is σ = 723104944. Its totient is φ = 722927700.

The previous prime is 723016303. The next prime is 723016337. The reversal of 723016321 is 123610327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123610327 = 9091 ⋅13597.

It is a cyclic number.

It is not a de Polignac number, because 723016321 - 2⁵ = 723016289 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723016121) 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, 30675 + ... + 48856.

It is an arithmetic number, because the mean of its divisors is an integer number (180776236).

Almost surely, 2^723016321 is an apocalyptic number.

It is an amenable number.

723016321 is a deficient number, since it is larger than the sum of its proper divisors (88623).

723016321 is an equidigital number, since it uses as much as digits as its factorization.

723016321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88622.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 723016321 is about 26888.9628100453. The cubic root of 723016321 is about 897.5308125350.

Adding to 723016321 its reverse (123610327), we get a palindrome (846626648).

The spelling of 723016321 in words is "seven hundred twenty-three million, sixteen thousand, three hundred twenty-one".