721140025 has 6 divisors (see below), whose sum is σ = 894213662. Its totient is φ = 576912000.

The previous prime is 721139989. The next prime is 721140029. The reversal of 721140025 is 520041127.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 34857216 + 686282809 = 5904^2 + 26197^2 .

It is not a de Polignac number, because 721140025 - 2⁹ = 721139513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721139978 and 721140005.

It is not an unprimeable number, because it can be changed into a prime (721140029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14422776 + ... + 14422825.

Almost surely, 2^721140025 is an apocalyptic number.

It is an amenable number.

721140025 is a deficient number, since it is larger than the sum of its proper divisors (173073637).

721140025 is a wasteful number, since it uses less digits than its factorization.

721140025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28845611 (or 28845606 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 721140025 is about 26854.0504393658. The cubic root of 721140025 is about 896.7537474027.

The spelling of 721140025 in words is "seven hundred twenty-one million, one hundred forty thousand, twenty-five".