531400523 has 2 divisors, whose sum is σ = 531400524. Its totient is φ = 531400522.

The previous prime is 531400489. The next prime is 531400561. The reversal of 531400523 is 325004135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531400523 - 2¹⁰ = 531399499 is a prime.

It is not a weakly prime, because it can be changed into another prime (531402523) 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, 265700261 + 265700262.

It is an arithmetic number, because the mean of its divisors is an integer number (265700262).

Almost surely, 2^531400523 is an apocalyptic number.

531400523 is a deficient number, since it is larger than the sum of its proper divisors (1).

531400523 is an equidigital number, since it uses as much as digits as its factorization.

531400523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 531400523 is about 23052.1262142996. The cubic root of 531400523 is about 809.9794350314.

Adding to 531400523 its reverse (325004135), we get a palindrome (856404658).

The spelling of 531400523 in words is "five hundred thirty-one million, four hundred thousand, five hundred twenty-three".