531603649 has 2 divisors, whose sum is σ = 531603650. Its totient is φ = 531603648.

The previous prime is 531603599. The next prime is 531603659. The reversal of 531603649 is 946306135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510443649 + 21160000 = 22593^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 531603649 - 2¹⁵ = 531570881 is a prime.

It is not a weakly prime, because it can be changed into another prime (531603659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265801824 + 265801825.

It is an arithmetic number, because the mean of its divisors is an integer number (265801825).

Almost surely, 2^531603649 is an apocalyptic number.

It is an amenable number.

531603649 is a deficient number, since it is larger than the sum of its proper divisors (1).

531603649 is an equidigital number, since it uses as much as digits as its factorization.

531603649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 531603649 is about 23056.5315908529. The cubic root of 531603649 is about 810.0826258242.

The spelling of 531603649 in words is "five hundred thirty-one million, six hundred three thousand, six hundred forty-nine".