16749121 has 2 divisors, whose sum is σ = 16749122. Its totient is φ = 16749120.

The previous prime is 16749107. The next prime is 16749157. The reversal of 16749121 is 12194761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 435600 = 4039^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 16749121 - 2¹³ = 16740929 is a prime.

It is not a weakly prime, because it can be changed into another prime (16749191) 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, 8374560 + 8374561.

It is an arithmetic number, because the mean of its divisors is an integer number (8374561).

Almost surely, 2^16749121 is an apocalyptic number.

It is an amenable number.

16749121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16749121 is an equidigital number, since it uses as much as digits as its factorization.

16749121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 16749121 is about 4092.5689975857. The cubic root of 16749121 is about 255.8570216005.

The spelling of 16749121 in words is "sixteen million, seven hundred forty-nine thousand, one hundred twenty-one".