261129 has 16 divisors (see below), whose sum is σ = 391104. Its totient is φ = 153600.

The previous prime is 261127. The next prime is 261167. The reversal of 261129 is 921162.

It is not a de Polignac number, because 261129 - 2¹ = 261127 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1257 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (24444).

2²⁶¹¹²⁹ is an apocalyptic number.

It is an amenable number.

261129 is a deficient number, since it is larger than the sum of its proper divisors (129975).

261129 is a wasteful number, since it uses less digits than its factorization.

261129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248.

The product of its digits is 216, while the sum is 21.

The square root of 261129 is about 511.0078277287. The cubic root of 261129 is about 63.9172922506.

The spelling of 261129 in words is "two hundred sixty-one thousand, one hundred twenty-nine".