1721079625 has 16 divisors (see below), whose sum is σ = 2163607056. Its totient is φ = 1366800000.

The previous prime is 1721079599. The next prime is 1721079629. The reversal of 1721079625 is 5269701271.

It can be written as a sum of positive squares in 8 ways, for example, as 799532176 + 921547449 = 28276^2 + 30357^2 .

It is not a de Polignac number, because 1721079625 - 2⁷ = 1721079497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721079629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33126 + ... + 67375.

It is an arithmetic number, because the mean of its divisors is an integer number (135225441).

Almost surely, 2^1721079625 is an apocalyptic number.

It is an amenable number.

1721079625 is a deficient number, since it is larger than the sum of its proper divisors (442527431).

1721079625 is a wasteful number, since it uses less digits than its factorization.

1721079625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100653 (or 100643 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 1721079625 is about 41485.8966999630. The cubic root of 1721079625 is about 1198.3959180656.

The spelling of 1721079625 in words is "one billion, seven hundred twenty-one million, seventy-nine thousand, six hundred twenty-five".