16909969 has 2 divisors, whose sum is σ = 16909970. Its totient is φ = 16909968.

The previous prime is 16909957. The next prime is 16909979. The reversal of 16909969 is 96990961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 5349969 = 3400^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 16909969 - 2¹³ = 16901777 is a prime.

It is a super-3 number, since 3×16909969³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (16909979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8454984 + 8454985.

It is an arithmetic number, because the mean of its divisors is an integer number (8454985).

Almost surely, 2^16909969 is an apocalyptic number.

It is an amenable number.

16909969 is a deficient number, since it is larger than the sum of its proper divisors (1).

16909969 is an equidigital number, since it uses as much as digits as its factorization.

16909969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 16909969 is about 4112.1732696957. The cubic root of 16909969 is about 256.6734435346.

The spelling of 16909969 in words is "sixteen million, nine hundred nine thousand, nine hundred sixty-nine".