409901 has 2 divisors, whose sum is σ = 409902. Its totient is φ = 409900.

The previous prime is 409897. The next prime is 409909. The reversal of 409901 is 109904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276676 + 133225 = 526^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 409901 - 2² = 409897 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204950 + 204951.

It is an arithmetic number, because the mean of its divisors is an integer number (204951).

2⁴⁰⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

409901 is a deficient number, since it is larger than the sum of its proper divisors (1).

409901 is an equidigital number, since it uses as much as digits as its factorization.

409901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 409901 is about 640.2351130639. The cubic root of 409901 is about 74.2836085272.

The spelling of 409901 in words is "four hundred nine thousand, nine hundred one".