409117669 has 2 divisors, whose sum is σ = 409117670. Its totient is φ = 409117668.

The previous prime is 409117651. The next prime is 409117697. The reversal of 409117669 is 966711904.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377330625 + 31787044 = 19425^2 + 5638^2 .

It is a cyclic number.

It is not a de Polignac number, because 409117669 - 2⁵ = 409117637 is a prime.

It is a super-2 number, since 2×409117669² = 334754534175987122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409117619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204558834 + 204558835.

It is an arithmetic number, because the mean of its divisors is an integer number (204558835).

Almost surely, 2^409117669 is an apocalyptic number.

It is an amenable number.

409117669 is a deficient number, since it is larger than the sum of its proper divisors (1).

409117669 is an equidigital number, since it uses as much as digits as its factorization.

409117669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 409117669 is about 20226.6573857373. The cubic root of 409117669 is about 742.3625907830.

The spelling of 409117669 in words is "four hundred nine million, one hundred seventeen thousand, six hundred sixty-nine".