16681849 has 2 divisors, whose sum is σ = 16681850. Its totient is φ = 16681848.

The previous prime is 16681843. The next prime is 16681897. The reversal of 16681849 is 94818661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 133225 = 4068^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 16681849 - 2⁵ = 16681817 is a prime.

It is not a weakly prime, because it can be changed into another prime (16681843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340924 + 8340925.

It is an arithmetic number, because the mean of its divisors is an integer number (8340925).

Almost surely, 2^16681849 is an apocalyptic number.

It is an amenable number.

16681849 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681849 is an equidigital number, since it uses as much as digits as its factorization.

16681849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 16681849 is about 4084.3419298585. The cubic root of 16681849 is about 255.5140163598.

The spelling of 16681849 in words is "sixteen million, six hundred eighty-one thousand, eight hundred forty-nine".