531385 has 4 divisors (see below), whose sum is σ = 637668. Its totient is φ = 425104.

The previous prime is 531383. The next prime is 531457. The reversal of 531385 is 583135.

531385 = 226² + 227² + ... + 235².

It is a happy number.

531385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 423801 + 107584 = 651^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 531385 - 2¹ = 531383 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (531383) 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, 53134 + ... + 53143.

It is an arithmetic number, because the mean of its divisors is an integer number (159417).

2⁵³¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

531385 is a deficient number, since it is larger than the sum of its proper divisors (106283).

531385 is a wasteful number, since it uses less digits than its factorization.

531385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106282.

The product of its digits is 1800, while the sum is 25.

The square root of 531385 is about 728.9615902090. The cubic root of 531385 is about 80.9971548053.

The spelling of 531385 in words is "five hundred thirty-one thousand, three hundred eighty-five".