531365 has 4 divisors (see below), whose sum is σ = 637644. Its totient is φ = 425088.

The previous prime is 531359. The next prime is 531383. The reversal of 531365 is 563135.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56644 + 474721 = 238^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 531365 - 2¹⁸ = 269221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531365.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531365.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53132 + ... + 53141.

It is an arithmetic number, because the mean of its divisors is an integer number (159411).

2⁵³¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

531365 is a deficient number, since it is larger than the sum of its proper divisors (106279).

531365 is a wasteful number, since it uses less digits than its factorization.

531365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106278.

The product of its digits is 1350, while the sum is 23.

The square root of 531365 is about 728.9478719360. The cubic root of 531365 is about 80.9961386159.

The spelling of 531365 in words is "five hundred thirty-one thousand, three hundred sixty-five".