863649841 has 8 divisors (see below), whose sum is σ = 893762280. Its totient is φ = 833559552.

The previous prime is 863649833. The next prime is 863649869. The reversal of 863649841 is 148946368.

It can be written as a sum of positive squares in 4 ways, for example, as 507195441 + 356454400 = 22521^2 + 18880^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 863649841 - 2³ = 863649833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863649811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132331 + ... + 138703.

It is an arithmetic number, because the mean of its divisors is an integer number (111720285).

Almost surely, 2^863649841 is an apocalyptic number.

It is an amenable number.

863649841 is a deficient number, since it is larger than the sum of its proper divisors (30112439).

863649841 is a wasteful number, since it uses less digits than its factorization.

863649841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075.

The product of its digits is 995328, while the sum is 49.

The square root of 863649841 is about 29387.9199842384. The cubic root of 863649841 is about 952.3119464884.

The spelling of 863649841 in words is "eight hundred sixty-three million, six hundred forty-nine thousand, eight hundred forty-one".