261147 has 4 divisors (see below), whose sum is σ = 348200. Its totient is φ = 174096.

The previous prime is 261127. The next prime is 261167. The reversal of 261147 is 741162.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (261127) and next prime (261167).

It is not a de Polignac number, because 261147 - 2¹¹ = 259099 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261147.

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 3 ways as a sum of consecutive naturals, for example, 43522 + ... + 43527.

It is an arithmetic number, because the mean of its divisors is an integer number (87050).

2²⁶¹¹⁴⁷ is an apocalyptic number.

261147 is a deficient number, since it is larger than the sum of its proper divisors (87053).

261147 is an equidigital number, since it uses as much as digits as its factorization.

261147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87052.

The product of its digits is 336, while the sum is 21.

The square root of 261147 is about 511.0254396799. The cubic root of 261147 is about 63.9187608541.

The spelling of 261147 in words is "two hundred sixty-one thousand, one hundred forty-seven".