531631649 has 2 divisors, whose sum is σ = 531631650. Its totient is φ = 531631648.

The previous prime is 531631613. The next prime is 531631669. The reversal of 531631649 is 946136135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531625249 + 6400 = 23057^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531631649 is a prime.

It is not a weakly prime, because it can be changed into another prime (531631669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265815824 + 265815825.

It is an arithmetic number, because the mean of its divisors is an integer number (265815825).

Almost surely, 2^531631649 is an apocalyptic number.

It is an amenable number.

531631649 is a deficient number, since it is larger than the sum of its proper divisors (1).

531631649 is an equidigital number, since it uses as much as digits as its factorization.

531631649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 531631649 is about 23057.1387860680. The cubic root of 531631649 is about 810.0968481465.

The spelling of 531631649 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred forty-nine".