261080249 has 8 divisors (see below), whose sum is σ = 263945088. Its totient is φ = 258228880.

The previous prime is 261080207. The next prime is 261080257. The reversal of 261080249 is 942080162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261080249 - 2¹⁶ = 261014713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261080299) 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 7 ways as a sum of consecutive naturals, for example, 38384 + ... + 44670.

It is an arithmetic number, because the mean of its divisors is an integer number (32993136).

Almost surely, 2^261080249 is an apocalyptic number.

It is an amenable number.

261080249 is a deficient number, since it is larger than the sum of its proper divisors (2864839).

261080249 is a wasteful number, since it uses less digits than its factorization.

261080249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 261080249 is about 16157.9778747218. The cubic root of 261080249 is about 639.1331436252.

The spelling of 261080249 in words is "two hundred sixty-one million, eighty thousand, two hundred forty-nine".