723655221 has 4 divisors (see below), whose sum is σ = 964873632. Its totient is φ = 482436812.

The previous prime is 723655199. The next prime is 723655249. The reversal of 723655221 is 122556327.

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.

It is a cyclic number.

It is not a de Polignac number, because 723655221 - 2⁵ = 723655189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723655421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120609201 + ... + 120609206.

It is an arithmetic number, because the mean of its divisors is an integer number (241218408).

Almost surely, 2^723655221 is an apocalyptic number.

It is an amenable number.

723655221 is a deficient number, since it is larger than the sum of its proper divisors (241218411).

723655221 is a wasteful number, since it uses less digits than its factorization.

723655221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241218410.

The product of its digits is 25200, while the sum is 33.

The square root of 723655221 is about 26900.8405259018. The cubic root of 723655221 is about 897.7951051455.

The spelling of 723655221 in words is "seven hundred twenty-three million, six hundred fifty-five thousand, two hundred twenty-one".