827863521 has 4 divisors (see below), whose sum is σ = 1103818032. Its totient is φ = 551909012.

The previous prime is 827863489. The next prime is 827863549. The reversal of 827863521 is 125368728.

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 827863521 - 2⁵ = 827863489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (827863571) 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 3 ways as a sum of consecutive naturals, for example, 137977251 + ... + 137977256.

It is an arithmetic number, because the mean of its divisors is an integer number (275954508).

Almost surely, 2^827863521 is an apocalyptic number.

It is an amenable number.

827863521 is a deficient number, since it is larger than the sum of its proper divisors (275954511).

827863521 is a wasteful number, since it uses less digits than its factorization.

827863521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275954510.

The product of its digits is 161280, while the sum is 42.

The square root of 827863521 is about 28772.6175555857. The cubic root of 827863521 is about 938.9725914372.

The spelling of 827863521 in words is "eight hundred twenty-seven million, eight hundred sixty-three thousand, five hundred twenty-one".