1722001009 has 9 divisors (see below), whose sum is σ = 1830003361. Its totient is φ = 1620042880.

The previous prime is 1722001003. The next prime is 1722001013. The reversal of 1722001009 is 9001002271.

The square root of 1722001009 is 41497.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 51480625 + 1670520384 = 7175^2 + 40872^2 .

It is not a de Polignac number, because 1722001009 - 2⁵ = 1722000977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722001003) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 704229 + ... + 706669.

Almost surely, 2^1722001009 is an apocalyptic number.

1722001009 is the 41497-th square number.

1722001009 is the 20749-th centered octagonal number.

It is an amenable number.

1722001009 is a deficient number, since it is larger than the sum of its proper divisors (108002352).

1722001009 is an frugal number, since it uses more digits than its factorization.

1722001009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The cubic root of 1722001009 is about 1198.6097345997.

The spelling of 1722001009 in words is "one billion, seven hundred twenty-two million, one thousand, nine".