261310655 has 8 divisors (see below), whose sum is σ = 332018352. Its totient is φ = 196751488.

The previous prime is 261310631. The next prime is 261310669. The reversal of 261310655 is 556013162.

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 261310655 - 2¹⁶ = 261245119 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1537037 + ... + 1537206.

It is an arithmetic number, because the mean of its divisors is an integer number (41502294).

Almost surely, 2^261310655 is an apocalyptic number.

261310655 is a deficient number, since it is larger than the sum of its proper divisors (70707697).

261310655 is a wasteful number, since it uses less digits than its factorization.

261310655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074265.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 261310655 is about 16165.1060930635. The cubic root of 261310655 is about 639.3211021978.

The spelling of 261310655 in words is "two hundred sixty-one million, three hundred ten thousand, six hundred fifty-five".