16835561 has 2 divisors, whose sum is σ = 16835562. Its totient is φ = 16835560.

The previous prime is 16835557. The next prime is 16835569. The reversal of 16835561 is 16553861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 2059225 = 3844^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 16835561 - 2² = 16835557 is a prime.

It is a super-2 number, since 2×16835561² = 566872228369442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16835569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8417780 + 8417781.

It is an arithmetic number, because the mean of its divisors is an integer number (8417781).

Almost surely, 2^16835561 is an apocalyptic number.

It is an amenable number.

16835561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16835561 is an equidigital number, since it uses as much as digits as its factorization.

16835561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 16835561 is about 4103.1160110336. The cubic root of 16835561 is about 256.2964146739.

The spelling of 16835561 in words is "sixteen million, eight hundred thirty-five thousand, five hundred sixty-one".