261051208 has 48 divisors (see below), whose sum is σ = 546957180. Its totient is φ = 116688000.

The previous prime is 261051199. The next prime is 261051209. The reversal of 261051208 is 802150162.

It can be written as a sum of positive squares in 2 ways, for example, as 257217444 + 3833764 = 16038^2 + 1958^2 .

It is not an unprimeable number, because it can be changed into a prime (261051209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56838 + ... + 61258.

Almost surely, 2^261051208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261051208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273478590).

261051208 is an abundant number, since it is smaller than the sum of its proper divisors (285905972).

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

261051208 is a wasteful number, since it uses less digits than its factorization.

261051208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 261051208 is about 16157.0791914876. The cubic root of 261051208 is about 639.1094449681.

The spelling of 261051208 in words is "two hundred sixty-one million, fifty-one thousand, two hundred eight".