861024155 has 16 divisors (see below), whose sum is σ = 1047229344. Its totient is φ = 679511040.

The previous prime is 861024139. The next prime is 861024187. The reversal of 861024155 is 551420168.

It is not a de Polignac number, because 861024155 - 2⁴ = 861024139 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 15 ways as a sum of consecutive naturals, for example, 412715 + ... + 414795.

It is an arithmetic number, because the mean of its divisors is an integer number (65451834).

Almost surely, 2^861024155 is an apocalyptic number.

861024155 is a deficient number, since it is larger than the sum of its proper divisors (186205189).

861024155 is a wasteful number, since it uses less digits than its factorization.

861024155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 861024155 is about 29343.2130994545. The cubic root of 861024155 is about 951.3458873631.

The spelling of 861024155 in words is "eight hundred sixty-one million, twenty-four thousand, one hundred fifty-five".