725049221 has 4 divisors (see below), whose sum is σ = 780822252. Its totient is φ = 669276192.

The previous prime is 725049181. The next prime is 725049229. The reversal of 725049221 is 122940527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234426721 + 490622500 = 15311^2 + 22150^2 .

It is a de Polignac number, because none of the positive numbers 2^k-725049221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725049229) 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, 27886496 + ... + 27886521.

It is an arithmetic number, because the mean of its divisors is an integer number (195205563).

Almost surely, 2^725049221 is an apocalyptic number.

It is an amenable number.

725049221 is a deficient number, since it is larger than the sum of its proper divisors (55773031).

725049221 is a wasteful number, since it uses less digits than its factorization.

725049221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55773030.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 725049221 is about 26926.7380311838. The cubic root of 725049221 is about 898.3712191019.

Adding to 725049221 its reverse (122940527), we get a palindrome (847989748).

The spelling of 725049221 in words is "seven hundred twenty-five million, forty-nine thousand, two hundred twenty-one".