723242209 has 2 divisors, whose sum is σ = 723242210. Its totient is φ = 723242208.

The previous prime is 723242197. The next prime is 723242231. The reversal of 723242209 is 902242327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548262225 + 174979984 = 23415^2 + 13228^2 .

It is a cyclic number.

It is not a de Polignac number, because 723242209 - 2¹⁹ = 722717921 is a prime.

It is not a weakly prime, because it can be changed into another prime (723242279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361621104 + 361621105.

It is an arithmetic number, because the mean of its divisors is an integer number (361621105).

Almost surely, 2^723242209 is an apocalyptic number.

It is an amenable number.

723242209 is a deficient number, since it is larger than the sum of its proper divisors (1).

723242209 is an equidigital number, since it uses as much as digits as its factorization.

723242209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 723242209 is about 26893.1628671676. The cubic root of 723242209 is about 897.6242730025.

The spelling of 723242209 in words is "seven hundred twenty-three million, two hundred forty-two thousand, two hundred nine".