261441642139 has 2 divisors, whose sum is σ = 261441642140. Its totient is φ = 261441642138.

The previous prime is 261441642103. The next prime is 261441642199. The reversal of 261441642139 is 931246144162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261441642139 - 2¹⁵ = 261441609371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261441642095 and 261441642104.

It is not a weakly prime, because it can be changed into another prime (261441642199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130720821069 + 130720821070.

It is an arithmetic number, because the mean of its divisors is an integer number (130720821070).

Almost surely, 2^261441642139 is an apocalyptic number.

261441642139 is a deficient number, since it is larger than the sum of its proper divisors (1).

261441642139 is an equidigital number, since it uses as much as digits as its factorization.

261441642139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The spelling of 261441642139 in words is "two hundred sixty-one billion, four hundred forty-one million, six hundred forty-two thousand, one hundred thirty-nine".