725511521 has 8 divisors (see below), whose sum is σ = 836763840. Its totient is φ = 616161168.

The previous prime is 725511497. The next prime is 725511529. The reversal of 725511521 is 125115527.

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

It is not a de Polignac number, because 725511521 - 2¹⁴ = 725495137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725511529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474671 + ... + 476196.

It is an arithmetic number, because the mean of its divisors is an integer number (104595480).

Almost surely, 2^725511521 is an apocalyptic number.

It is an amenable number.

725511521 is a deficient number, since it is larger than the sum of its proper divisors (111252319).

725511521 is a wasteful number, since it uses less digits than its factorization.

725511521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950983.

The product of its digits is 3500, while the sum is 29.

The square root of 725511521 is about 26935.3210673272. The cubic root of 725511521 is about 898.5621159235.

The spelling of 725511521 in words is "seven hundred twenty-five million, five hundred eleven thousand, five hundred twenty-one".