261047 has 4 divisors (see below), whose sum is σ = 267456. Its totient is φ = 254640.

The previous prime is 261043. The next prime is 261059. The reversal of 261047 is 740162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740162 = 2 ⋅370081.

It is a cyclic number.

It is not a de Polignac number, because 261047 - 2² = 261043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261047.

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, 3143 + ... + 3224.

It is an arithmetic number, because the mean of its divisors is an integer number (66864).

2²⁶¹⁰⁴⁷ is an apocalyptic number.

261047 is a deficient number, since it is larger than the sum of its proper divisors (6409).

261047 is an equidigital number, since it uses as much as digits as its factorization.

261047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 261047 is about 510.9275878243. The cubic root of 261047 is about 63.9106010920.

The spelling of 261047 in words is "two hundred sixty-one thousand, forty-seven".