261079 has 16 divisors (see below), whose sum is σ = 340480. Its totient is φ = 194400.

The previous prime is 261077. The next prime is 261089. The reversal of 261079 is 970162.

261079 = 130² + 131² + ... + 143².

It is a cyclic number.

It is not a de Polignac number, because 261079 - 2¹ = 261077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261071) 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, 1654 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (21280).

2²⁶¹⁰⁷⁹ is an apocalyptic number.

261079 is a deficient number, since it is larger than the sum of its proper divisors (79401).

261079 is a wasteful number, since it uses less digits than its factorization.

261079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 261079 is about 510.9589024569. The cubic root of 261079 is about 63.9132124426.

The spelling of 261079 in words is "two hundred sixty-one thousand, seventy-nine".