261283910149 has 2 divisors, whose sum is σ = 261283910150. Its totient is φ = 261283910148.

The previous prime is 261283910143. The next prime is 261283910201. The reversal of 261283910149 is 941019382162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261179257249 + 104652900 = 511057^2 + 10230^2 .

It is a cyclic number.

It is not a de Polignac number, because 261283910149 - 2⁷ = 261283910021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261283910099 and 261283910108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261283910143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130641955074 + 130641955075.

It is an arithmetic number, because the mean of its divisors is an integer number (130641955075).

Almost surely, 2^261283910149 is an apocalyptic number.

It is an amenable number.

261283910149 is a deficient number, since it is larger than the sum of its proper divisors (1).

261283910149 is an equidigital number, since it uses as much as digits as its factorization.

261283910149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 261283910149 in words is "two hundred sixty-one billion, two hundred eighty-three million, nine hundred ten thousand, one hundred forty-nine".