721451825 has 6 divisors (see below), whose sum is σ = 894600294. Its totient is φ = 577161440.

The previous prime is 721451791. The next prime is 721451837. The reversal of 721451825 is 528154127.

It can be written as a sum of positive squares in 3 ways, for example, as 19784704 + 701667121 = 4448^2 + 26489^2 .

It is not a de Polignac number, because 721451825 - 2⁶ = 721451761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14429012 + ... + 14429061.

It is an arithmetic number, because the mean of its divisors is an integer number (149100049).

Almost surely, 2^721451825 is an apocalyptic number.

It is an amenable number.

721451825 is a deficient number, since it is larger than the sum of its proper divisors (173148469).

721451825 is a wasteful number, since it uses less digits than its factorization.

721451825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28858083 (or 28858078 counting only the distinct ones).

The product of its digits is 22400, while the sum is 35.

The square root of 721451825 is about 26859.8552676667. The cubic root of 721451825 is about 896.8829722043.

The spelling of 721451825 in words is "seven hundred twenty-one million, four hundred fifty-one thousand, eight hundred twenty-five".