261827 has 4 divisors (see below), whose sum is σ = 267960. Its totient is φ = 255696.

The previous prime is 261823. The next prime is 261847. The reversal of 261827 is 728162.

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

It is a cyclic number.

It is not a de Polignac number, because 261827 - 2² = 261823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261796 and 261805.

It is not an unprimeable number, because it can be changed into a prime (261823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3002 + ... + 3087.

It is an arithmetic number, because the mean of its divisors is an integer number (66990).

2²⁶¹⁸²⁷ is an apocalyptic number.

261827 is a deficient number, since it is larger than the sum of its proper divisors (6133).

261827 is an equidigital number, since it uses as much as digits as its factorization.

261827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6132.

The product of its digits is 1344, while the sum is 26.

The square root of 261827 is about 511.6903360432. The cubic root of 261827 is about 63.9741920683.

Adding to 261827 its reverse (728162), we get a palindrome (989989).

The spelling of 261827 in words is "two hundred sixty-one thousand, eight hundred twenty-seven".