523601261 has 2 divisors, whose sum is σ = 523601262. Its totient is φ = 523601260.

The previous prime is 523601249. The next prime is 523601303. The reversal of 523601261 is 162106325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354757225 + 168844036 = 18835^2 + 12994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523601261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 523601261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523601231) 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, 261800630 + 261800631.

It is an arithmetic number, because the mean of its divisors is an integer number (261800631).

Almost surely, 2^523601261 is an apocalyptic number.

It is an amenable number.

523601261 is a deficient number, since it is larger than the sum of its proper divisors (1).

523601261 is an equidigital number, since it uses as much as digits as its factorization.

523601261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 523601261 is about 22882.3351299643. The cubic root of 523601261 is about 805.9972522981.

Adding to 523601261 its reverse (162106325), we get a palindrome (685707586).

The spelling of 523601261 in words is "five hundred twenty-three million, six hundred one thousand, two hundred sixty-one".