863010821 has 4 divisors (see below), whose sum is σ = 864108192. Its totient is φ = 861913452.

The previous prime is 863010791. The next prime is 863010833. The reversal of 863010821 is 128010368.

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 not a de Polignac number, because 863010821 - 2¹⁴ = 862994437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863010871) 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, 547505 + ... + 549078.

It is an arithmetic number, because the mean of its divisors is an integer number (216027048).

Almost surely, 2^863010821 is an apocalyptic number.

It is an amenable number.

863010821 is a deficient number, since it is larger than the sum of its proper divisors (1097371).

863010821 is a wasteful number, since it uses less digits than its factorization.

863010821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097370.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 863010821 is about 29377.0458181213. The cubic root of 863010821 is about 952.0770146514.

The spelling of 863010821 in words is "eight hundred sixty-three million, ten thousand, eight hundred twenty-one".