261128487239 has 2 divisors, whose sum is σ = 261128487240. Its totient is φ = 261128487238.

The previous prime is 261128487223. The next prime is 261128487251. The reversal of 261128487239 is 932784821162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261128487239 - 2⁴ = 261128487223 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261128481239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130564243619 + 130564243620.

It is an arithmetic number, because the mean of its divisors is an integer number (130564243620).

Almost surely, 2^261128487239 is an apocalyptic number.

261128487239 is a deficient number, since it is larger than the sum of its proper divisors (1).

261128487239 is an equidigital number, since it uses as much as digits as its factorization.

261128487239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The spelling of 261128487239 in words is "two hundred sixty-one billion, one hundred twenty-eight million, four hundred eighty-seven thousand, two hundred thirty-nine".