16331009 has 2 divisors, whose sum is σ = 16331010. Its totient is φ = 16331008.

The previous prime is 16330991. The next prime is 16331041. The reversal of 16331009 is 90013361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 9409 = 4040^2 + 97^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16331009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16331069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165504 + 8165505.

It is an arithmetic number, because the mean of its divisors is an integer number (8165505).

Almost surely, 2^16331009 is an apocalyptic number.

It is an amenable number.

16331009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16331009 is an equidigital number, since it uses as much as digits as its factorization.

16331009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 16331009 is about 4041.1643124228. The cubic root of 16331009 is about 253.7100510609.

The spelling of 16331009 in words is "sixteen million, three hundred thirty-one thousand, nine".