725594909 has 6 divisors (see below), whose sum is σ = 785703546. Its totient is φ = 669779760.

The previous prime is 725594899. The next prime is 725594923. The reversal of 725594909 is 909495527.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6175225 + 719419684 = 2485^2 + 26822^2 .

It is not a de Polignac number, because 725594909 - 2¹⁶ = 725529373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725594209) 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 5 ways as a sum of consecutive naturals, for example, 2146562 + ... + 2146899.

It is an arithmetic number, because the mean of its divisors is an integer number (130950591).

Almost surely, 2^725594909 is an apocalyptic number.

It is an amenable number.

725594909 is a deficient number, since it is larger than the sum of its proper divisors (60108637).

725594909 is a wasteful number, since it uses less digits than its factorization.

725594909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293487 (or 4293474 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 50.

The square root of 725594909 is about 26936.8689531653. The cubic root of 725594909 is about 898.5965405674.

The spelling of 725594909 in words is "seven hundred twenty-five million, five hundred ninety-four thousand, nine hundred nine".