16569139 has 2 divisors, whose sum is σ = 16569140. Its totient is φ = 16569138.

The previous prime is 16569127. The next prime is 16569149. The reversal of 16569139 is 93196561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16569139 - 2⁵ = 16569107 is a prime.

It is not a weakly prime, because it can be changed into another prime (16569149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8284569 + 8284570.

It is an arithmetic number, because the mean of its divisors is an integer number (8284570).

Almost surely, 2^16569139 is an apocalyptic number.

16569139 is a deficient number, since it is larger than the sum of its proper divisors (1).

16569139 is an equidigital number, since it uses as much as digits as its factorization.

16569139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 16569139 is about 4070.5207283590. The cubic root of 16569139 is about 254.9372599716.

The spelling of 16569139 in words is "sixteen million, five hundred sixty-nine thousand, one hundred thirty-nine".