409240109 has 2 divisors, whose sum is σ = 409240110. Its totient is φ = 409240108.

The previous prime is 409240063. The next prime is 409240121. The reversal of 409240109 is 901042904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314956009 + 94284100 = 17747^2 + 9710^2 .

It is a cyclic number.

It is not a de Polignac number, because 409240109 - 2¹² = 409236013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409240129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204620054 + 204620055.

It is an arithmetic number, because the mean of its divisors is an integer number (204620055).

Almost surely, 2^409240109 is an apocalyptic number.

It is an amenable number.

409240109 is a deficient number, since it is larger than the sum of its proper divisors (1).

409240109 is an equidigital number, since it uses as much as digits as its factorization.

409240109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 409240109 is about 20229.6838581328. The cubic root of 409240109 is about 742.4366410431.

The spelling of 409240109 in words is "four hundred nine million, two hundred forty thousand, one hundred nine".