521231 has 2 divisors, whose sum is σ = 521232. Its totient is φ = 521230.

The previous prime is 521201. The next prime is 521243. The reversal of 521231 is 132125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521231 - 2⁶ = 521167 is a prime.

It is a super-2 number, since 2×521231² = 543363510722, 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 (521201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260615 + 260616.

It is an arithmetic number, because the mean of its divisors is an integer number (260616).

2⁵²¹²³¹ is an apocalyptic number.

521231 is a deficient number, since it is larger than the sum of its proper divisors (1).

521231 is an equidigital number, since it uses as much as digits as its factorization.

521231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60, while the sum is 14.

The square root of 521231 is about 721.9632954659. The cubic root of 521231 is about 80.4779204649.

Adding to 521231 its reverse (132125), we get a palindrome (653356).

The spelling of 521231 in words is "five hundred twenty-one thousand, two hundred thirty-one".