409316921 has 4 divisors (see below), whose sum is σ = 440802852. Its totient is φ = 377830992.

The previous prime is 409316881. The next prime is 409316927. The reversal of 409316921 is 129613904.

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 201640000 + 207676921 = 14200^2 + 14411^2 .

It is a cyclic number.

It is not a de Polignac number, because 409316921 - 2¹⁰ = 409315897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409316927) 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, 15742946 + ... + 15742971.

It is an arithmetic number, because the mean of its divisors is an integer number (110200713).

Almost surely, 2^409316921 is an apocalyptic number.

It is an amenable number.

409316921 is a deficient number, since it is larger than the sum of its proper divisors (31485931).

409316921 is a wasteful number, since it uses less digits than its factorization.

409316921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31485930.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 409316921 is about 20231.5822663478. The cubic root of 409316921 is about 742.4830884909.

The spelling of 409316921 in words is "four hundred nine million, three hundred sixteen thousand, nine hundred twenty-one".