831215985 has 8 divisors (see below), whose sum is σ = 1329945600. Its totient is φ = 443315184.

The previous prime is 831215963. The next prime is 831215993. The reversal of 831215985 is 589512138.

831215985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 831215985 - 2¹⁶ = 831150449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27707185 + ... + 27707214.

It is an arithmetic number, because the mean of its divisors is an integer number (166243200).

Almost surely, 2^831215985 is an apocalyptic number.

It is an amenable number.

831215985 is a deficient number, since it is larger than the sum of its proper divisors (498729615).

831215985 is a wasteful number, since it uses less digits than its factorization.

831215985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55414407.

The product of its digits is 86400, while the sum is 42.

The square root of 831215985 is about 28830.8165857299. The cubic root of 831215985 is about 940.2383524886.

The spelling of 831215985 in words is "eight hundred thirty-one million, two hundred fifteen thousand, nine hundred eighty-five".