261289032529 has 16 divisors (see below), whose sum is σ = 299310450048. Its totient is φ = 223441650432.

The previous prime is 261289032527. The next prime is 261289032533. The reversal of 261289032529 is 925230982162.

It is a happy number.

261289032529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261289032529 - 2¹ = 261289032527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261289032523) 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 in 15 ways as a sum of consecutive naturals, for example, 7792969 + ... + 7826425.

It is an arithmetic number, because the mean of its divisors is an integer number (18706903128).

Almost surely, 2^261289032529 is an apocalyptic number.

It is an amenable number.

261289032529 is a deficient number, since it is larger than the sum of its proper divisors (38021417519).

261289032529 is a wasteful number, since it uses less digits than its factorization.

261289032529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36024.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 261289032529 in words is "two hundred sixty-one billion, two hundred eighty-nine million, thirty-two thousand, five hundred twenty-nine".