724687009 has 2 divisors, whose sum is σ = 724687010. Its totient is φ = 724687008.

The previous prime is 724687001. The next prime is 724687021. The reversal of 724687009 is 900786427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506475025 + 218211984 = 22505^2 + 14772^2 .

It is a cyclic number.

It is not a de Polignac number, because 724687009 - 2³ = 724687001 is a prime.

It is a super-2 number, since 2×724687009² = 1050342522026732162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (724687001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362343504 + 362343505.

It is an arithmetic number, because the mean of its divisors is an integer number (362343505).

Almost surely, 2^724687009 is an apocalyptic number.

It is an amenable number.

724687009 is a deficient number, since it is larger than the sum of its proper divisors (1).

724687009 is an equidigital number, since it uses as much as digits as its factorization.

724687009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 724687009 is about 26920.0113112903. The cubic root of 724687009 is about 898.2215947599.

The spelling of 724687009 in words is "seven hundred twenty-four million, six hundred eighty-seven thousand, nine".