16697969 has 2 divisors, whose sum is σ = 16697970. Its totient is φ = 16697968.

The previous prime is 16697951. The next prime is 16697981. The reversal of 16697969 is 96979661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 214369 = 4060^2 + 463^2 .

It is a cyclic number.

It is not a de Polignac number, because 16697969 - 2²⁰ = 15649393 is a prime.

It is a super-2 number, since 2×16697969² = 557644337449922, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 16697969.

It is not a weakly prime, because it can be changed into another prime (16697909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8348984 + 8348985.

It is an arithmetic number, because the mean of its divisors is an integer number (8348985).

Almost surely, 2^16697969 is an apocalyptic number.

It is an amenable number.

16697969 is a deficient number, since it is larger than the sum of its proper divisors (1).

16697969 is an equidigital number, since it uses as much as digits as its factorization.

16697969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 53.

The square root of 16697969 is about 4086.3148434745. The cubic root of 16697969 is about 255.5962926098.

The spelling of 16697969 in words is "sixteen million, six hundred ninety-seven thousand, nine hundred sixty-nine".