404531 has 2 divisors, whose sum is σ = 404532. Its totient is φ = 404530.

The previous prime is 404527. The next prime is 404533. The reversal of 404531 is 135404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404531 - 2² = 404527 is a prime.

It is a super-2 number, since 2×404531² = 327290659922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 404533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202265 + 202266.

It is an arithmetic number, because the mean of its divisors is an integer number (202266).

2⁴⁰⁴⁵³¹ is an apocalyptic number.

404531 is a deficient number, since it is larger than the sum of its proper divisors (1).

404531 is an equidigital number, since it uses as much as digits as its factorization.

404531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 404531 is about 636.0275151281. The cubic root of 404531 is about 73.9577918539.

Adding to 404531 its reverse (135404), we get a palindrome (539935).

The spelling of 404531 in words is "four hundred four thousand, five hundred thirty-one".