523405261 has 2 divisors, whose sum is σ = 523405262. Its totient is φ = 523405260.

The previous prime is 523405241. The next prime is 523405321. The reversal of 523405261 is 162504325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510308100 + 13097161 = 22590^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 523405261 - 2⁵ = 523405229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523405241) 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, 261702630 + 261702631.

It is an arithmetic number, because the mean of its divisors is an integer number (261702631).

Almost surely, 2^523405261 is an apocalyptic number.

It is an amenable number.

523405261 is a deficient number, since it is larger than the sum of its proper divisors (1).

523405261 is an equidigital number, since it uses as much as digits as its factorization.

523405261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 523405261 is about 22878.0519494121. The cubic root of 523405261 is about 805.8966699218.

Adding to 523405261 its reverse (162504325), we get a palindrome (685909586).

The spelling of 523405261 in words is "five hundred twenty-three million, four hundred five thousand, two hundred sixty-one".