725033721 has 4 divisors (see below), whose sum is σ = 966711632. Its totient is φ = 483355812.

The previous prime is 725033717. The next prime is 725033741. The reversal of 725033721 is 127330527.

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 725033721 - 2² = 725033717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725033741) 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 3 ways as a sum of consecutive naturals, for example, 120838951 + ... + 120838956.

It is an arithmetic number, because the mean of its divisors is an integer number (241677908).

Almost surely, 2^725033721 is an apocalyptic number.

It is an amenable number.

725033721 is a deficient number, since it is larger than the sum of its proper divisors (241677911).

725033721 is a wasteful number, since it uses less digits than its factorization.

725033721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241677910.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 725033721 is about 26926.4502116413. The cubic root of 725033721 is about 898.3648173052.

The spelling of 725033721 in words is "seven hundred twenty-five million, thirty-three thousand, seven hundred twenty-one".