261130529 has 16 divisors (see below), whose sum is σ = 301561920. Its totient is φ = 223863360.

The previous prime is 261130511. The next prime is 261130531. The reversal of 261130529 is 925031162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261130529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (261130589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4199 + ... + 23235.

It is an arithmetic number, because the mean of its divisors is an integer number (18847620).

Almost surely, 2^261130529 is an apocalyptic number.

261130529 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

261130529 is a deficient number, since it is larger than the sum of its proper divisors (40431391).

261130529 is a wasteful number, since it uses less digits than its factorization.

261130529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19120.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 261130529 is about 16159.5336875790. The cubic root of 261130529 is about 639.1741700297.

The spelling of 261130529 in words is "two hundred sixty-one million, one hundred thirty thousand, five hundred twenty-nine".