861280115 has 8 divisors (see below), whose sum is σ = 1035449808. Its totient is φ = 687748320.

The previous prime is 861280097. The next prime is 861280141. The reversal of 861280115 is 511082168.

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

It is not a de Polignac number, because 861280115 - 2¹⁶ = 861214579 is a prime.

It is a Duffinian 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, 156497 + ... + 161906.

It is an arithmetic number, because the mean of its divisors is an integer number (129431226).

Almost surely, 2^861280115 is an apocalyptic number.

861280115 is a deficient number, since it is larger than the sum of its proper divisors (174169693).

861280115 is a wasteful number, since it uses less digits than its factorization.

861280115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318949.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 861280115 is about 29347.5742609164. The cubic root of 861280115 is about 951.4401481209.

The spelling of 861280115 in words is "eight hundred sixty-one million, two hundred eighty thousand, one hundred fifteen".