531745 has 4 divisors (see below), whose sum is σ = 638100. Its totient is φ = 425392.

The previous prime is 531731. The next prime is 531793. The reversal of 531745 is 547135.

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 254016 + 277729 = 504^2 + 527^2 .

It is a cyclic number.

It is not a de Polignac number, because 531745 - 2¹³ = 523553 is a prime.

It is a d-powerful number, because it can be written as 5³ + 3¹² + 7² + 1 + 4 + 5³ .

531745 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53170 + ... + 53179.

It is an arithmetic number, because the mean of its divisors is an integer number (159525).

2⁵³¹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

531745 is a deficient number, since it is larger than the sum of its proper divisors (106355).

531745 is a wasteful number, since it uses less digits than its factorization.

531745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106354.

The product of its digits is 2100, while the sum is 25.

The square root of 531745 is about 729.2084749919. The cubic root of 531745 is about 81.0154418561.

The spelling of 531745 in words is "five hundred thirty-one thousand, seven hundred forty-five".