721453825 has 12 divisors (see below), whose sum is σ = 894957228. Its totient is φ = 576934400.

The previous prime is 721453819. The next prime is 721453841. The reversal of 721453825 is 528354127.

It can be written as a sum of positive squares in 6 ways, for example, as 7441984 + 714011841 = 2728^2 + 26721^2 .

It is not a de Polignac number, because 721453825 - 2⁷ = 721453697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90189 + ... + 97861.

It is an arithmetic number, because the mean of its divisors is an integer number (74579769).

Almost surely, 2^721453825 is an apocalyptic number.

It is an amenable number.

721453825 is a deficient number, since it is larger than the sum of its proper divisors (173503403).

721453825 is a wasteful number, since it uses less digits than its factorization.

721453825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444 (or 11439 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 721453825 is about 26859.8924979234. The cubic root of 721453825 is about 896.8838009796.

The spelling of 721453825 in words is "seven hundred twenty-one million, four hundred fifty-three thousand, eight hundred twenty-five".