523005649 has 2 divisors, whose sum is σ = 523005650. Its totient is φ = 523005648.

The previous prime is 523005641. The next prime is 523005673. The reversal of 523005649 is 946500325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295599249 + 227406400 = 17193^2 + 15080^2 .

It is a cyclic number.

It is not a de Polignac number, because 523005649 - 2³ = 523005641 is a prime.

It is a super-2 number, since 2×523005649² = 547069817771822402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (523005641) 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, 261502824 + 261502825.

It is an arithmetic number, because the mean of its divisors is an integer number (261502825).

Almost surely, 2^523005649 is an apocalyptic number.

It is an amenable number.

523005649 is a deficient number, since it is larger than the sum of its proper divisors (1).

523005649 is an equidigital number, since it uses as much as digits as its factorization.

523005649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 523005649 is about 22869.3167584867. The cubic root of 523005649 is about 805.6915210642.

The spelling of 523005649 in words is "five hundred twenty-three million, five thousand, six hundred forty-nine".