531506231 has 2 divisors, whose sum is σ = 531506232. Its totient is φ = 531506230.

The previous prime is 531506179. The next prime is 531506251. The reversal of 531506231 is 132605135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531506231 - 2⁶ = 531506167 is a prime.

It is a super-2 number, since 2×531506231² = 564997747183650722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531506231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531506251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265753115 + 265753116.

It is an arithmetic number, because the mean of its divisors is an integer number (265753116).

Almost surely, 2^531506231 is an apocalyptic number.

531506231 is a deficient number, since it is larger than the sum of its proper divisors (1).

531506231 is an equidigital number, since it uses as much as digits as its factorization.

531506231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 531506231 is about 23054.4189039759. The cubic root of 531506231 is about 810.0331394255.

The spelling of 531506231 in words is "five hundred thirty-one million, five hundred six thousand, two hundred thirty-one".