261121103 has 2 divisors, whose sum is σ = 261121104. Its totient is φ = 261121102.

The previous prime is 261121097. The next prime is 261121141. The reversal of 261121103 is 301121162.

261121103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261121103 - 2⁶ = 261121039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261121703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130560551 + 130560552.

It is an arithmetic number, because the mean of its divisors is an integer number (130560552).

Almost surely, 2^261121103 is an apocalyptic number.

261121103 is a deficient number, since it is larger than the sum of its proper divisors (1).

261121103 is an equidigital number, since it uses as much as digits as its factorization.

261121103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 261121103 is about 16159.2420304914. The cubic root of 261121103 is about 639.1664792039.

Adding to 261121103 its reverse (301121162), we get a palindrome (562242265).

The spelling of 261121103 in words is "two hundred sixty-one million, one hundred twenty-one thousand, one hundred three".