725009 has 2 divisors, whose sum is σ = 725010. Its totient is φ = 725008.

The previous prime is 724993. The next prime is 725041. The reversal of 725009 is 900527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394384 + 330625 = 628^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 725009 - 2⁴ = 724993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (725099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362504 + 362505.

It is an arithmetic number, because the mean of its divisors is an integer number (362505).

2⁷²⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

725009 is a deficient number, since it is larger than the sum of its proper divisors (1).

725009 is an equidigital number, since it uses as much as digits as its factorization.

725009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 725009 is about 851.4746032619. The cubic root of 725009 is about 89.8354606870.

The spelling of 725009 in words is "seven hundred twenty-five thousand, nine".