531864247 has 2 divisors, whose sum is σ = 531864248. Its totient is φ = 531864246.

The previous prime is 531864217. The next prime is 531864251. The reversal of 531864247 is 742468135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531864247 - 2¹⁵ = 531831479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531864217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265932123 + 265932124.

It is an arithmetic number, because the mean of its divisors is an integer number (265932124).

Almost surely, 2^531864247 is an apocalyptic number.

531864247 is a deficient number, since it is larger than the sum of its proper divisors (1).

531864247 is an equidigital number, since it uses as much as digits as its factorization.

531864247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 40.

The square root of 531864247 is about 23062.1821820920. The cubic root of 531864247 is about 810.2149746938.

The spelling of 531864247 in words is "five hundred thirty-one million, eight hundred sixty-four thousand, two hundred forty-seven".