725605169 has 8 divisors (see below), whose sum is σ = 768907080. Its totient is φ = 682372096.

The previous prime is 725605151. The next prime is 725605183. The reversal of 725605169 is 961506527.

It can be written as a sum of positive squares in 4 ways, for example, as 211993600 + 513611569 = 14560^2 + 22663^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725605169 is a prime.

It is a super-2 number, since 2×725605169² = 1053005722559037122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725625169) 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, 5357 + ... + 38469.

It is an arithmetic number, because the mean of its divisors is an integer number (96113385).

Almost surely, 2^725605169 is an apocalyptic number.

It is an amenable number.

725605169 is a deficient number, since it is larger than the sum of its proper divisors (43301911).

725605169 is a wasteful number, since it uses less digits than its factorization.

725605169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34419.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 725605169 is about 26937.0593977888. The cubic root of 725605169 is about 898.6007759688.

The spelling of 725605169 in words is "seven hundred twenty-five million, six hundred five thousand, one hundred sixty-nine".