725253221 has 8 divisors (see below), whose sum is σ = 904211904. Its totient is φ = 565132320.

The previous prime is 725253197. The next prime is 725253233. The reversal of 725253221 is 122352527.

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 725253221 - 2¹⁸ = 724991077 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 (725253241) 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, 4709360 + ... + 4709513.

It is an arithmetic number, because the mean of its divisors is an integer number (113026488).

Almost surely, 2^725253221 is an apocalyptic number.

It is an amenable number.

725253221 is a deficient number, since it is larger than the sum of its proper divisors (178958683).

725253221 is a wasteful number, since it uses less digits than its factorization.

725253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9418891.

The product of its digits is 8400, while the sum is 29.

The square root of 725253221 is about 26930.5258210827. The cubic root of 725253221 is about 898.4554665056.

The spelling of 725253221 in words is "seven hundred twenty-five million, two hundred fifty-three thousand, two hundred twenty-one".