531445 has 8 divisors (see below), whose sum is σ = 642744. Its totient is φ = 421824.

The previous prime is 531383. The next prime is 531457. The reversal of 531445 is 544135.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 376996 = 393^2 + 614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531445 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (80343).

531445 is a Friedman number, since it can be written as 4+(5*5+3-1)^4, using all its digits and the basic arithmetic operations.

2⁵³¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

531445 is a deficient number, since it is larger than the sum of its proper divisors (111299).

531445 is a wasteful number, since it uses less digits than its factorization.

531445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839.

The product of its digits is 1200, while the sum is 22.

The square root of 531445 is about 729.0027434791. The cubic root of 531445 is about 81.0002032205. Note that the first 3 decimals are identical.

The spelling of 531445 in words is "five hundred thirty-one thousand, four hundred forty-five".