261230851969 has 2 divisors, whose sum is σ = 261230851970. Its totient is φ = 261230851968.

The previous prime is 261230851909. The next prime is 261230852017. The reversal of 261230851969 is 969158032162.

261230851969 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 can be written as a sum of positive squares in only one way, i.e., 223788601969 + 37442250000 = 473063^2 + 193500^2 .

It is a cyclic number.

It is not a de Polignac number, because 261230851969 - 2²⁷ = 261096634241 is a prime.

It is a super-2 number, since 2×261230851969² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261230851909) 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, 130615425984 + 130615425985.

It is an arithmetic number, because the mean of its divisors is an integer number (130615425985).

Almost surely, 2^261230851969 is an apocalyptic number.

It is an amenable number.

261230851969 is a deficient number, since it is larger than the sum of its proper divisors (1).

261230851969 is an equidigital number, since it uses as much as digits as its factorization.

261230851969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 261230851969 in words is "two hundred sixty-one billion, two hundred thirty million, eight hundred fifty-one thousand, nine hundred sixty-nine".