853647861 has 24 divisors (see below), whose sum is σ = 1265181120. Its totient is φ = 511529920.

The previous prime is 853647833. The next prime is 853647869. The reversal of 853647861 is 168746358.

It is not a de Polignac number, because 853647861 - 2⁹ = 853647349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 853647861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853647869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19096 + ... + 45518.

It is an arithmetic number, because the mean of its divisors is an integer number (52715880).

Almost surely, 2^853647861 is an apocalyptic number.

It is an amenable number.

853647861 is a deficient number, since it is larger than the sum of its proper divisors (411533259).

853647861 is a wasteful number, since it uses less digits than its factorization.

853647861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26537 (or 26526 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 853647861 is about 29217.2527969349. The cubic root of 853647861 is about 948.6214024399.

The spelling of 853647861 in words is "eight hundred fifty-three million, six hundred forty-seven thousand, eight hundred sixty-one".