261049 has 4 divisors (see below), whose sum is σ = 262260. Its totient is φ = 259840.

The previous prime is 261043. The next prime is 261059. The reversal of 261049 is 940162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 940162 = 2 ⋅470081.

It can be written as a sum of positive squares in 2 ways, for example, as 71824 + 189225 = 268^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 261049 - 2⁵ = 261017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184 + ... + 745.

It is an arithmetic number, because the mean of its divisors is an integer number (65565).

2²⁶¹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

261049 is a deficient number, since it is larger than the sum of its proper divisors (1211).

261049 is an equidigital number, since it uses as much as digits as its factorization.

261049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261049 is about 510.9295450451. The cubic root of 261049 is about 63.9107643077.

The spelling of 261049 in words is "two hundred sixty-one thousand, forty-nine".