261080250 has 64 divisors (see below), whose sum is σ = 657027072. Its totient is φ = 69048000.

The previous prime is 261080207. The next prime is 261080257. The reversal of 261080250 is 52080162.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261080250.

It is not an unprimeable number, because it can be changed into a prime (261080257) 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 31 ways as a sum of consecutive naturals, for example, 93880 + ... + 96620.

It is an arithmetic number, because the mean of its divisors is an integer number (10266048).

Almost surely, 2^261080250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261080250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328513536).

261080250 is an abundant number, since it is smaller than the sum of its proper divisors (395946822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261080250 is a wasteful number, since it uses less digits than its factorization.

261080250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 261080250 is about 16157.9779056663. The cubic root of 261080250 is about 639.1331444412.

The spelling of 261080250 in words is "two hundred sixty-one million, eighty thousand, two hundred fifty".