261351113 has 2 divisors, whose sum is σ = 261351114. Its totient is φ = 261351112.

The previous prime is 261351107. The next prime is 261351127. The reversal of 261351113 is 311153162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140944384 + 120406729 = 11872^2 + 10973^2 .

It is a cyclic number.

It is not a de Polignac number, because 261351113 - 2¹² = 261347017 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 (261354113) 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, 130675556 + 130675557.

It is an arithmetic number, because the mean of its divisors is an integer number (130675557).

Almost surely, 2^261351113 is an apocalyptic number.

It is an amenable number.

261351113 is a deficient number, since it is larger than the sum of its proper divisors (1).

261351113 is an equidigital number, since it uses as much as digits as its factorization.

261351113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 261351113 is about 16166.3574437781. The cubic root of 261351113 is about 639.3540952629.

The spelling of 261351113 in words is "two hundred sixty-one million, three hundred fifty-one thousand, one hundred thirteen".