531366 has 32 divisors (see below), whose sum is σ = 1185408. Its totient is φ = 157440.

The previous prime is 531359. The next prime is 531383. The reversal of 531366 is 663135.

It is a congruent number.

It is an unprimeable number.

531366 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 in 15 ways as a sum of consecutive naturals, for example, 5430 + ... + 5526.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁵³¹³⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592704).

531366 is an abundant number, since it is smaller than the sum of its proper divisors (654042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531366 is a wasteful number, since it uses less digits than its factorization.

531366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its digits is 1620, while the sum is 24.

The square root of 531366 is about 728.9485578558. The cubic root of 531366 is about 80.9961894260.

Subtracting 531366 from its reverse (663135), we obtain a square (131769 = 363²).

The spelling of 531366 in words is "five hundred thirty-one thousand, three hundred sixty-six".