261080281 has 16 divisors (see below), whose sum is σ = 332150400. Its totient is φ = 203436240.

The previous prime is 261080263. The next prime is 261080297. The reversal of 261080281 is 182080162.

It is not a de Polignac number, because 261080281 - 2⁹ = 261079769 is a prime.

It is a super-2 number, since 2×261080281² = 136325826254077922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261080081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30826 + ... + 38371.

It is an arithmetic number, because the mean of its divisors is an integer number (20759400).

Almost surely, 2^261080281 is an apocalyptic number.

It is an amenable number.

261080281 is a deficient number, since it is larger than the sum of its proper divisors (71070119).

261080281 is an equidigital number, since it uses as much as digits as its factorization.

261080281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69229 (or 69215 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 261080281 is about 16157.9788649447. The cubic root of 261080281 is about 639.1331697375.

The spelling of 261080281 in words is "two hundred sixty-one million, eighty thousand, two hundred eighty-one".