261855293 has 8 divisors (see below), whose sum is σ = 299373312. Its totient is φ = 224364816.

The previous prime is 261855287. The next prime is 261855311. The reversal of 261855293 is 392558162.

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 261855293 - 2⁴ = 261855277 is a prime.

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 261855293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261855203) 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, 21071 + ... + 31107.

It is an arithmetic number, because the mean of its divisors is an integer number (37421664).

Almost surely, 2^261855293 is an apocalyptic number.

It is an amenable number.

261855293 is a deficient number, since it is larger than the sum of its proper divisors (37518019).

261855293 is a wasteful number, since it uses less digits than its factorization.

261855293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13771.

The product of its digits is 129600, while the sum is 41.

The square root of 261855293 is about 16181.9434246941. The cubic root of 261855293 is about 639.7649633365.

The spelling of 261855293 in words is "two hundred sixty-one million, eight hundred fifty-five thousand, two hundred ninety-three".