261128487223 has 2 divisors, whose sum is σ = 261128487224. Its totient is φ = 261128487222.

The previous prime is 261128487187. The next prime is 261128487239. The reversal of 261128487223 is 322784821162.

261128487223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261128487223 - 2²¹ = 261126390071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261128487923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130564243611 + 130564243612.

It is an arithmetic number, because the mean of its divisors is an integer number (130564243612).

Almost surely, 2^261128487223 is an apocalyptic number.

261128487223 is a deficient number, since it is larger than the sum of its proper divisors (1).

261128487223 is an equidigital number, since it uses as much as digits as its factorization.

261128487223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The spelling of 261128487223 in words is "two hundred sixty-one billion, one hundred twenty-eight million, four hundred eighty-seven thousand, two hundred twenty-three".