16417409 has 2 divisors, whose sum is σ = 16417410. Its totient is φ = 16417408.

The previous prime is 16417391. The next prime is 16417411. The reversal of 16417409 is 90471461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14250625 + 2166784 = 3775^2 + 1472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16417409 is a prime.

It is a Sophie Germain prime.

Together with 16417411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16417909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8208704 + 8208705.

It is an arithmetic number, because the mean of its divisors is an integer number (8208705).

Almost surely, 2^16417409 is an apocalyptic number.

It is an amenable number.

16417409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16417409 is an equidigital number, since it uses as much as digits as its factorization.

16417409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 16417409 is about 4051.8401992181. The cubic root of 16417409 is about 254.1566861380.

The spelling of 16417409 in words is "sixteen million, four hundred seventeen thousand, four hundred nine".