16409689 has 2 divisors, whose sum is σ = 16409690. Its totient is φ = 16409688.

The previous prime is 16409677. The next prime is 16409693. The reversal of 16409689 is 98690461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 369664 = 4005^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 16409689 - 2¹¹ = 16407641 is a prime.

It is not a weakly prime, because it can be changed into another prime (16409609) 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, 8204844 + 8204845.

It is an arithmetic number, because the mean of its divisors is an integer number (8204845).

Almost surely, 2^16409689 is an apocalyptic number.

It is an amenable number.

16409689 is a deficient number, since it is larger than the sum of its proper divisors (1).

16409689 is an equidigital number, since it uses as much as digits as its factorization.

16409689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 16409689 is about 4050.8874336372. The cubic root of 16409689 is about 254.1168423104.

The spelling of 16409689 in words is "sixteen million, four hundred nine thousand, six hundred eighty-nine".