861852959 has 32 divisors (see below), whose sum is σ = 987033600. Its totient is φ = 745763040.

The previous prime is 861852931. The next prime is 861852983. The reversal of 861852959 is 959258168.

It is a de Polignac number, because none of the positive numbers 2^k-861852959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861852959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861852919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4814732 + ... + 4814910.

It is an arithmetic number, because the mean of its divisors is an integer number (30844800).

Almost surely, 2^861852959 is an apocalyptic number.

861852959 is a deficient number, since it is larger than the sum of its proper divisors (125180641).

861852959 is a wasteful number, since it uses less digits than its factorization.

861852959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its digits is 1555200, while the sum is 53.

The square root of 861852959 is about 29357.3322868411. The cubic root of 861852959 is about 951.6510380824.

The spelling of 861852959 in words is "eight hundred sixty-one million, eight hundred fifty-two thousand, nine hundred fifty-nine".