863775521 has 4 divisors (see below), whose sum is σ = 987172032. Its totient is φ = 740379012.

The previous prime is 863775509. The next prime is 863775551. The reversal of 863775521 is 125577368.

It is a happy number.

863775521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 863775521 - 2²⁶ = 796666657 is a prime.

It is a super-2 number, since 2×863775521² = 1492216301357642882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (863775551) 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, 61698245 + ... + 61698258.

It is an arithmetic number, because the mean of its divisors is an integer number (246793008).

Almost surely, 2^863775521 is an apocalyptic number.

It is an amenable number.

863775521 is a deficient number, since it is larger than the sum of its proper divisors (123396511).

863775521 is a wasteful number, since it uses less digits than its factorization.

863775521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123396510.

The product of its digits is 352800, while the sum is 44.

The square root of 863775521 is about 29390.0582000104. The cubic root of 863775521 is about 952.3581383416.

The spelling of 863775521 in words is "eight hundred sixty-three million, seven hundred seventy-five thousand, five hundred twenty-one".