863815641 has 16 divisors (see below), whose sum is σ = 1241192064. Its totient is φ = 531218304.

The previous prime is 863815633. The next prime is 863815649. The reversal of 863815641 is 146518368.

It is an interprime number because it is at equal distance from previous prime (863815633) and next prime (863815649).

It is not a de Polignac number, because 863815641 - 2³ = 863815633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 863815593 and 863815602.

It is not an unprimeable number, because it can be changed into a prime (863815649) 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 15 ways as a sum of consecutive naturals, for example, 57940 + ... + 71306.

It is an arithmetic number, because the mean of its divisors is an integer number (77574504).

Almost surely, 2^863815641 is an apocalyptic number.

It is an amenable number.

863815641 is a deficient number, since it is larger than the sum of its proper divisors (377376423).

863815641 is a wasteful number, since it uses less digits than its factorization.

863815641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15040.

The product of its digits is 138240, while the sum is 42.

The square root of 863815641 is about 29390.7407358168. The cubic root of 863815641 is about 952.3728829198.

The spelling of 863815641 in words is "eight hundred sixty-three million, eight hundred fifteen thousand, six hundred forty-one".