409667669 has 2 divisors, whose sum is σ = 409667670. Its totient is φ = 409667668.

The previous prime is 409667567. The next prime is 409667701. The reversal of 409667669 is 966766904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370755025 + 38912644 = 19255^2 + 6238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409667669 is a prime.

It is a super-2 number, since 2×409667669² = 335655198047787122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 409667669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409697669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204833834 + 204833835.

It is an arithmetic number, because the mean of its divisors is an integer number (204833835).

Almost surely, 2^409667669 is an apocalyptic number.

It is an amenable number.

409667669 is a deficient number, since it is larger than the sum of its proper divisors (1).

409667669 is an equidigital number, since it uses as much as digits as its factorization.

409667669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The square root of 409667669 is about 20240.2487385901. The cubic root of 409667669 is about 742.6951084796.

The spelling of 409667669 in words is "four hundred nine million, six hundred sixty-seven thousand, six hundred sixty-nine".