531428 has 6 divisors (see below), whose sum is σ = 930006. Its totient is φ = 265712.

The previous prime is 531383. The next prime is 531457. The reversal of 531428 is 824135.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 1444 = 728^2 + 38^2 .

It is an Ulam number.

It is a nialpdrome in base 9 and base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531428.

It is an unprimeable number.

531428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66425 + ... + 66432.

It is an arithmetic number, because the mean of its divisors is an integer number (155001).

531428 is a Friedman number, since it can be written as ((2+1)^3)^4-8-5, using all its digits and the basic arithmetic operations.

2⁵³¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

531428 is a deficient number, since it is larger than the sum of its proper divisors (398578).

531428 is a wasteful number, since it uses less digits than its factorization.

531428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132861 (or 132859 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 531428 is about 728.9910836217. The cubic root of 531428 is about 80.9993395262. Note that the first 3 decimals are identical.

It can be divided in two parts, 531 and 428, that added together give a palindrome (959).

The spelling of 531428 in words is "five hundred thirty-one thousand, four hundred twenty-eight".