409531 has 4 divisors (see below), whose sum is σ = 417312. Its totient is φ = 401752.

The previous prime is 409529. The next prime is 409543. The reversal of 409531 is 135904.

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

It is a cyclic number.

It is not a de Polignac number, because 409531 - 2¹ = 409529 is a prime.

It is a super-2 number, since 2×409531² = 335431279922, which contains 22 as substring.

It is a Duffinian number.

409531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (409831) 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, 3811 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (104328).

2⁴⁰⁹⁵³¹ is an apocalyptic number.

409531 is a deficient number, since it is larger than the sum of its proper divisors (7781).

409531 is an equidigital number, since it uses as much as digits as its factorization.

409531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 409531 is about 639.9460914796. The cubic root of 409531 is about 74.2612509261.

The spelling of 409531 in words is "four hundred nine thousand, five hundred thirty-one".