201598306009 has 3 divisors (see below), whose sum is σ = 201598755007. Its totient is φ = 201597857012.

The previous prime is 201598305911. The next prime is 201598306033. The reversal of 201598306009 is 900603895102.

It is a happy number.

The square root of 201598306009 is 448997.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 112060910025 + 89537395984 = 334755^2 + 299228^2 .

It is not a de Polignac number, because 201598306009 - 2¹⁵ = 201598273241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201598306709) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 224499 + ... + 673495.

Almost surely, 2^201598306009 is an apocalyptic number.

201598306009 is the 448997-th square number.

201598306009 is the 224499-th centered octagonal number.

It is an amenable number.

201598306009 is a deficient number, since it is larger than the sum of its proper divisors (448998).

201598306009 is an frugal number, since it uses more digits than its factorization.

201598306009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897994 (or 448997 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 201598306009 in words is "two hundred one billion, five hundred ninety-eight million, three hundred six thousand, nine".