523242661 has 2 divisors, whose sum is σ = 523242662. Its totient is φ = 523242660.

The previous prime is 523242649. The next prime is 523242703. The reversal of 523242661 is 166242325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521254561 + 1988100 = 22831^2 + 1410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523242661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523242631) 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, 261621330 + 261621331.

It is an arithmetic number, because the mean of its divisors is an integer number (261621331).

Almost surely, 2^523242661 is an apocalyptic number.

It is an amenable number.

523242661 is a deficient number, since it is larger than the sum of its proper divisors (1).

523242661 is an equidigital number, since it uses as much as digits as its factorization.

523242661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 523242661 is about 22874.4980491376. The cubic root of 523242661 is about 805.8132085455.

Adding to 523242661 its reverse (166242325), we get a palindrome (689484986).

The spelling of 523242661 in words is "five hundred twenty-three million, two hundred forty-two thousand, six hundred sixty-one".