863909971 has 4 divisors (see below), whose sum is σ = 893700000. Its totient is φ = 834119944.

The previous prime is 863909941. The next prime is 863909987. The reversal of 863909971 is 179909368.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 863909971 - 2⁵ = 863909939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863909941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14894971 + ... + 14895028.

It is an arithmetic number, because the mean of its divisors is an integer number (223425000).

Almost surely, 2^863909971 is an apocalyptic number.

863909971 is a deficient number, since it is larger than the sum of its proper divisors (29790029).

863909971 is a wasteful number, since it uses less digits than its factorization.

863909971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29790028.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 863909971 is about 29392.3454491131. The cubic root of 863909971 is about 952.4075485204.

The spelling of 863909971 in words is "eight hundred sixty-three million, nine hundred nine thousand, nine hundred seventy-one".