545231 has 2 divisors, whose sum is σ = 545232. Its totient is φ = 545230.

The previous prime is 545213. The next prime is 545239. The reversal of 545231 is 132545.

545231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (545213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545231 is a prime.

It is a super-2 number, since 2×545231² = 594553686722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272615 + 272616.

It is an arithmetic number, because the mean of its divisors is an integer number (272616).

2⁵⁴⁵²³¹ is an apocalyptic number.

545231 is a deficient number, since it is larger than the sum of its proper divisors (1).

545231 is an equidigital number, since it uses as much as digits as its factorization.

545231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 20.

The square root of 545231 is about 738.3975893785. The cubic root of 545231 is about 81.6946306198.

Adding to 545231 its reverse (132545), we get a palindrome (677776).

Subtracting from 545231 its reverse (132545), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 545231 in words is "five hundred forty-five thousand, two hundred thirty-one".