261250849 has 8 divisors (see below), whose sum is σ = 276794280. Its totient is φ = 245726976.

The previous prime is 261250841. The next prime is 261250877. The reversal of 261250849 is 948052162.

It can be written as a sum of positive squares in 4 ways, for example, as 46335249 + 214915600 = 6807^2 + 14660^2 .

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

It is not a de Polignac number, because 261250849 - 2³ = 261250841 is a prime.

It is a super-2 number, since 2×261250849² = 136504012206441602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261250841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29647 + ... + 37435.

It is an arithmetic number, because the mean of its divisors is an integer number (34599285).

Almost surely, 2^261250849 is an apocalyptic number.

It is an amenable number.

261250849 is a deficient number, since it is larger than the sum of its proper divisors (15543431).

261250849 is a wasteful number, since it uses less digits than its factorization.

261250849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 261250849 is about 16163.2561385384. The cubic root of 261250849 is about 639.2723248078.

The spelling of 261250849 in words is "two hundred sixty-one million, two hundred fifty thousand, eight hundred forty-nine".