261116593 has 2 divisors, whose sum is σ = 261116594. Its totient is φ = 261116592.

The previous prime is 261116579. The next prime is 261116633. The reversal of 261116593 is 395611162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149010849 + 112105744 = 12207^2 + 10588^2 .

It is a cyclic number.

It is not a de Polignac number, because 261116593 - 2¹³ = 261108401 is a prime.

It is not a weakly prime, because it can be changed into another prime (261110593) 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, 130558296 + 130558297.

It is an arithmetic number, because the mean of its divisors is an integer number (130558297).

Almost surely, 2^261116593 is an apocalyptic number.

It is an amenable number.

261116593 is a deficient number, since it is larger than the sum of its proper divisors (1).

261116593 is an equidigital number, since it uses as much as digits as its factorization.

261116593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 261116593 is about 16159.1024812642. The cubic root of 261116593 is about 639.1627993566.

The spelling of 261116593 in words is "two hundred sixty-one million, one hundred sixteen thousand, five hundred ninety-three".