613522561 has 2 divisors, whose sum is σ = 613522562. Its totient is φ = 613522560.

The previous prime is 613522517. The next prime is 613522583. The reversal of 613522561 is 165225316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529690225 + 83832336 = 23015^2 + 9156^2 .

It is a cyclic number.

It is not a de Polignac number, because 613522561 - 2⁷ = 613522433 is a prime.

It is not a weakly prime, because it can be changed into another prime (613522961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306761280 + 306761281.

It is an arithmetic number, because the mean of its divisors is an integer number (306761281).

Almost surely, 2^613522561 is an apocalyptic number.

It is an amenable number.

613522561 is a deficient number, since it is larger than the sum of its proper divisors (1).

613522561 is an equidigital number, since it uses as much as digits as its factorization.

613522561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 613522561 is about 24769.3875782184. The cubic root of 613522561 is about 849.7219671976.

Adding to 613522561 its reverse (165225316), we get a palindrome (778747877).

The spelling of 613522561 in words is "six hundred thirteen million, five hundred twenty-two thousand, five hundred sixty-one".