261355050 has 144 divisors (see below), whose sum is σ = 787262112. Its totient is φ = 61603200.

The previous prime is 261355027. The next prime is 261355063. The reversal of 261355050 is 50553162.

261355050 is a `hidden beast` number, since 2 + 61 + 3 + 550 + 50 = 666.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 182437 + ... + 183863.

It is an arithmetic number, because the mean of its divisors is an integer number (5467098).

Almost surely, 2^261355050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261355050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393631056).

261355050 is an abundant number, since it is smaller than the sum of its proper divisors (525907062).

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

261355050 is a wasteful number, since it uses less digits than its factorization.

261355050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 261355050 is about 16166.4792085352. The cubic root of 261355050 is about 639.3573056624.

The spelling of 261355050 in words is "two hundred sixty-one million, three hundred fifty-five thousand, fifty".