515231 has 2 divisors, whose sum is σ = 515232. Its totient is φ = 515230.

The previous prime is 515227. The next prime is 515233. The reversal of 515231 is 132515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 515231 - 2² = 515227 is a prime.

It is a super-2 number, since 2×515231² = 530925966722, which contains 22 as substring.

Together with 515233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257615 + 257616.

It is an arithmetic number, because the mean of its divisors is an integer number (257616).

2⁵¹⁵²³¹ is an apocalyptic number.

515231 is a deficient number, since it is larger than the sum of its proper divisors (1).

515231 is an equidigital number, since it uses as much as digits as its factorization.

515231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 17.

The square root of 515231 is about 717.7959320030. The cubic root of 515231 is about 80.1679285036.

Adding to 515231 its reverse (132515), we get a palindrome (647746).

The spelling of 515231 in words is "five hundred fifteen thousand, two hundred thirty-one".