725533521 has 8 divisors (see below), whose sum is σ = 967641024. Its totient is φ = 483557520.

The previous prime is 725533511. The next prime is 725533537. The reversal of 725533521 is 125335527.

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

It is not a de Polignac number, because 725533521 - 2⁹ = 725533009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (725533511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19186 + ... + 42651.

It is an arithmetic number, because the mean of its divisors is an integer number (120955128).

Almost surely, 2^725533521 is an apocalyptic number.

It is an amenable number.

725533521 is a deficient number, since it is larger than the sum of its proper divisors (242107503).

725533521 is a wasteful number, since it uses less digits than its factorization.

725533521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65751.

The product of its digits is 31500, while the sum is 33.

The square root of 725533521 is about 26935.7294499332. The cubic root of 725533521 is about 898.5711983278.

The spelling of 725533521 in words is "seven hundred twenty-five million, five hundred thirty-three thousand, five hundred twenty-one".