261354113 has 2 divisors, whose sum is σ = 261354114. Its totient is φ = 261354112.

The previous prime is 261354109. The next prime is 261354143. The reversal of 261354113 is 311453162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164685889 + 96668224 = 12833^2 + 9832^2 .

It is a cyclic number.

It is not a de Polignac number, because 261354113 - 2² = 261354109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (261354103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130677056 + 130677057.

It is an arithmetic number, because the mean of its divisors is an integer number (130677057).

Almost surely, 2^261354113 is an apocalyptic number.

It is an amenable number.

261354113 is a deficient number, since it is larger than the sum of its proper divisors (1).

261354113 is an equidigital number, since it uses as much as digits as its factorization.

261354113 is an odious number, because the sum of its binary digits is odd.

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

The square root of 261354113 is about 16166.4502287917. The cubic root of 261354113 is about 639.3565415951.

The spelling of 261354113 in words is "two hundred sixty-one million, three hundred fifty-four thousand, one hundred thirteen".