1722500009 has 4 divisors (see below), whose sum is σ = 1724043204. Its totient is φ = 1720956816.

The previous prime is 1722499997. The next prime is 1722500033. The reversal of 1722500009 is 9000052271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 850597225 + 871902784 = 29165^2 + 29528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722500009 - 2¹⁶ = 1722434473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1722500099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769922 + ... + 772155.

It is an arithmetic number, because the mean of its divisors is an integer number (431010801).

Almost surely, 2^1722500009 is an apocalyptic number.

It is an amenable number.

1722500009 is a deficient number, since it is larger than the sum of its proper divisors (1543195).

1722500009 is a wasteful number, since it uses less digits than its factorization.

1722500009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543194.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1722500009 is about 41503.0120473201. The cubic root of 1722500009 is about 1198.7255007909.

The spelling of 1722500009 in words is "one billion, seven hundred twenty-two million, five hundred thousand, nine".