16520869 has 2 divisors, whose sum is σ = 16520870. Its totient is φ = 16520868.

The previous prime is 16520851. The next prime is 16520879. The reversal of 16520869 is 96802561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 21025 = 4062^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 16520869 - 2⁵ = 16520837 is a prime.

It is a super-2 number, since 2×16520869² = 545878225030322, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16520839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260434 + 8260435.

It is an arithmetic number, because the mean of its divisors is an integer number (8260435).

Almost surely, 2^16520869 is an apocalyptic number.

It is an amenable number.

16520869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16520869 is an equidigital number, since it uses as much as digits as its factorization.

16520869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 16520869 is about 4064.5871869109. The cubic root of 16520869 is about 254.6894540781.

The spelling of 16520869 in words is "sixteen million, five hundred twenty thousand, eight hundred sixty-nine".