725509109 has 8 divisors (see below), whose sum is σ = 784674072. Its totient is φ = 666823680.

The previous prime is 725509093. The next prime is 725509121. The reversal of 725509109 is 901905527.

It can be written as a sum of positive squares in 4 ways, for example, as 105001009 + 620508100 = 10247^2 + 24910^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725509109 - 2⁴ = 725509093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725509909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116732 + ... + 122789.

It is an arithmetic number, because the mean of its divisors is an integer number (98084259).

Almost surely, 2^725509109 is an apocalyptic number.

It is an amenable number.

725509109 is a deficient number, since it is larger than the sum of its proper divisors (59164963).

725509109 is a wasteful number, since it uses less digits than its factorization.

725509109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239767.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 725509109 is about 26935.2762933667. The cubic root of 725509109 is about 898.5611201506.

The spelling of 725509109 in words is "seven hundred twenty-five million, five hundred nine thousand, one hundred nine".