261533524721239 has 2 divisors, whose sum is σ = 261533524721240. Its totient is φ = 261533524721238.

The previous prime is 261533524721113. The next prime is 261533524721243. The reversal of 261533524721239 is 932127425335162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261533524721239 - 2³⁵ = 261499164982871 is a prime.

It is a super-2 number, since 2×261533524721239² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261533524721239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261533524721299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130766762360619 + 130766762360620.

It is an arithmetic number, because the mean of its divisors is an integer number (130766762360620).

Almost surely, 2^{261533524721239} is an apocalyptic number.

261533524721239 is a deficient number, since it is larger than the sum of its proper divisors (1).

261533524721239 is an equidigital number, since it uses as much as digits as its factorization.

261533524721239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 55.

The spelling of 261533524721239 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred twenty-four million, seven hundred twenty-one thousand, two hundred thirty-nine".