261525113 has 2 divisors, whose sum is σ = 261525114. Its totient is φ = 261525112.

The previous prime is 261525109. The next prime is 261525151. The reversal of 261525113 is 311525162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260241424 + 1283689 = 16132^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 261525113 - 2² = 261525109 is a prime.

It is not a weakly prime, because it can be changed into another prime (261525713) 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, 130762556 + 130762557.

It is an arithmetic number, because the mean of its divisors is an integer number (130762557).

Almost surely, 2^261525113 is an apocalyptic number.

It is an amenable number.

261525113 is a deficient number, since it is larger than the sum of its proper divisors (1).

261525113 is an equidigital number, since it uses as much as digits as its factorization.

261525113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 261525113 is about 16171.7380945896. The cubic root of 261525113 is about 639.4959515980.

The spelling of 261525113 in words is "two hundred sixty-one million, five hundred twenty-five thousand, one hundred thirteen".