409219109 has 4 divisors (see below), whose sum is σ = 440697516. Its totient is φ = 377740704.

The previous prime is 409219091. The next prime is 409219117. The reversal of 409219109 is 901912904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169650625 + 239568484 = 13025^2 + 15478^2 .

It is a cyclic number.

It is not a de Polignac number, because 409219109 - 2¹² = 409215013 is a prime.

It is a super-3 number, since 3×409219109³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409219159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15739184 + ... + 15739209.

It is an arithmetic number, because the mean of its divisors is an integer number (110174379).

Almost surely, 2^409219109 is an apocalyptic number.

It is an amenable number.

409219109 is a deficient number, since it is larger than the sum of its proper divisors (31478407).

409219109 is a wasteful number, since it uses less digits than its factorization.

409219109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31478406.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 409219109 is about 20229.1648122210. The cubic root of 409219109 is about 742.4239415416.

The spelling of 409219109 in words is "four hundred nine million, two hundred nineteen thousand, one hundred nine".