261228863 has 8 divisors (see below), whose sum is σ = 299381760. Its totient is φ = 223284600.

The previous prime is 261228833. The next prime is 261228881. The reversal of 261228863 is 368822162.

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

It is not a de Polignac number, because 261228863 - 2¹⁰ = 261227839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261228823) 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, 49463 + ... + 54488.

It is an arithmetic number, because the mean of its divisors is an integer number (37422720).

Almost surely, 2^261228863 is an apocalyptic number.

261228863 is a deficient number, since it is larger than the sum of its proper divisors (38152897).

261228863 is a wasteful number, since it uses less digits than its factorization.

261228863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104317.

The product of its digits is 55296, while the sum is 38.

The square root of 261228863 is about 16162.5760013681. The cubic root of 261228863 is about 639.2543912959.

The spelling of 261228863 in words is "two hundred sixty-one million, two hundred twenty-eight thousand, eight hundred sixty-three".