409504421 has 2 divisors, whose sum is σ = 409504422. Its totient is φ = 409504420.

The previous prime is 409504409. The next prime is 409504457. The reversal of 409504421 is 124405904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359519521 + 49984900 = 18961^2 + 7070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409504421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409504471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204752210 + 204752211.

It is an arithmetic number, because the mean of its divisors is an integer number (204752211).

Almost surely, 2^409504421 is an apocalyptic number.

It is an amenable number.

409504421 is a deficient number, since it is larger than the sum of its proper divisors (1).

409504421 is an equidigital number, since it uses as much as digits as its factorization.

409504421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 409504421 is about 20236.2155799942. The cubic root of 409504421 is about 742.5964434652.

The spelling of 409504421 in words is "four hundred nine million, five hundred four thousand, four hundred twenty-one".