261727281 has 24 divisors (see below), whose sum is σ = 409106880. Its totient is φ = 166894992.

The previous prime is 261727247. The next prime is 261727309. The reversal of 261727281 is 182727162.

261727281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261727281 - 2⁷ = 261727153 is a prime.

It is a super-2 number, since 2×261727281² = 137002339239305922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261727211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17826 + ... + 29003.

It is an arithmetic number, because the mean of its divisors is an integer number (17046120).

Almost surely, 2^261727281 is an apocalyptic number.

It is an amenable number.

261727281 is a deficient number, since it is larger than the sum of its proper divisors (147379599).

261727281 is an equidigital number, since it uses as much as digits as its factorization.

261727281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46867 (or 46855 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 261727281 is about 16177.9875448092. The cubic root of 261727281 is about 639.6606933524.

The spelling of 261727281 in words is "two hundred sixty-one million, seven hundred twenty-seven thousand, two hundred eighty-one".