531409 has 4 divisors (see below), whose sum is σ = 534016. Its totient is φ = 528804.

The previous prime is 531383. The next prime is 531457. The reversal of 531409 is 904135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531409 - 2⁷ = 531281 is a prime.

It is a Duffinian number.

531409 is a lucky number.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 531409.

It is not an unprimeable number, because it can be changed into a prime (501409) 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, 969 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (133504).

2⁵³¹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

531409 is a deficient number, since it is larger than the sum of its proper divisors (2607).

531409 is a wasteful number, since it uses less digits than its factorization.

531409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606.

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

The square root of 531409 is about 728.9780517958. The cubic root of 531409 is about 80.9983741989.

The spelling of 531409 in words is "five hundred thirty-one thousand, four hundred nine".