861415853 has 4 divisors (see below), whose sum is σ = 862303968. Its totient is φ = 860527740.

The previous prime is 861415847. The next prime is 861415873. The reversal of 861415853 is 358514168.

861415853 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861415853 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 861415853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861415813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442601 + ... + 444542.

It is an arithmetic number, because the mean of its divisors is an integer number (215575992).

Almost surely, 2^861415853 is an apocalyptic number.

It is an amenable number.

861415853 is a deficient number, since it is larger than the sum of its proper divisors (888115).

861415853 is an equidigital number, since it uses as much as digits as its factorization.

861415853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888114.

The product of its digits is 115200, while the sum is 41.

The square root of 861415853 is about 29349.8867629843. The cubic root of 861415853 is about 951.4901279113.

It can be divided in two parts, 861415 and 853, that added together give a palindrome (862268).

The spelling of 861415853 in words is "eight hundred sixty-one million, four hundred fifteen thousand, eight hundred fifty-three".