16731242209 has 6 divisors (see below), whose sum is σ = 18390539090. Its totient is φ = 15210220080.

The previous prime is 16731242183. The next prime is 16731242263. The reversal of 16731242209 is 90224213761.

It can be written as a sum of positive squares in only one way, i.e., 9742282209 + 6988960000 = 98703^2 + 83600^2 .

It is not a de Polignac number, because 16731242209 - 2¹¹ = 16731240161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16731242299) 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, 69137244 + ... + 69137485.

Almost surely, 2^16731242209 is an apocalyptic number.

It is an amenable number.

16731242209 is a deficient number, since it is larger than the sum of its proper divisors (1659296881).

16731242209 is a wasteful number, since it uses less digits than its factorization.

16731242209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138274751 (or 138274740 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 16731242209 in words is "sixteen billion, seven hundred thirty-one million, two hundred forty-two thousand, two hundred nine".