531631603 has 2 divisors, whose sum is σ = 531631604. Its totient is φ = 531631602.

The previous prime is 531631601. The next prime is 531631613. The reversal of 531631603 is 306136135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531631603 - 2¹ = 531631601 is a prime.

It is a super-2 number, since 2×531631603² = 565264322616699218, which contains 22 as substring.

Together with 531631601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (531631601) 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, 265815801 + 265815802.

It is an arithmetic number, because the mean of its divisors is an integer number (265815802).

Almost surely, 2^531631603 is an apocalyptic number.

531631603 is a deficient number, since it is larger than the sum of its proper divisors (1).

531631603 is an equidigital number, since it uses as much as digits as its factorization.

531631603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 531631603 is about 23057.1377885461. The cubic root of 531631603 is about 810.0968247817.

Adding to 531631603 its reverse (306136135), we get a palindrome (837767738).

The spelling of 531631603 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred three".