725479221 has 4 divisors (see below), whose sum is σ = 967305632. Its totient is φ = 483652812.

The previous prime is 725479201. The next prime is 725479231. The reversal of 725479221 is 122974527.

725479221 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 725479221 - 2⁵ = 725479189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 725479221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725479201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120913201 + ... + 120913206.

It is an arithmetic number, because the mean of its divisors is an integer number (241826408).

Almost surely, 2^725479221 is an apocalyptic number.

It is an amenable number.

725479221 is a deficient number, since it is larger than the sum of its proper divisors (241826411).

725479221 is a wasteful number, since it uses less digits than its factorization.

725479221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241826410.

The product of its digits is 70560, while the sum is 39.

The square root of 725479221 is about 26934.7214761913. The cubic root of 725479221 is about 898.5487809701.

The spelling of 725479221 in words is "seven hundred twenty-five million, four hundred seventy-nine thousand, two hundred twenty-one".