861298915 has 4 divisors (see below), whose sum is σ = 1033558704. Its totient is φ = 689039128.

The previous prime is 861298903. The next prime is 861298957. The reversal of 861298915 is 519892168.

861298915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861298915 - 2⁵ = 861298883 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86129887 + ... + 86129896.

It is an arithmetic number, because the mean of its divisors is an integer number (258389676).

Almost surely, 2^861298915 is an apocalyptic number.

861298915 is a deficient number, since it is larger than the sum of its proper divisors (172259789).

861298915 is a wasteful number, since it uses less digits than its factorization.

861298915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172259788.

The product of its digits is 311040, while the sum is 49.

The square root of 861298915 is about 29347.8945582132. The cubic root of 861298915 is about 951.4470707408.

The spelling of 861298915 in words is "eight hundred sixty-one million, two hundred ninety-eight thousand, nine hundred fifteen".