863528009 has 2 divisors, whose sum is σ = 863528010. Its totient is φ = 863528008.

The previous prime is 863527969. The next prime is 863528011. The reversal of 863528009 is 900825368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507375625 + 356152384 = 22525^2 + 18872^2 .

It is a cyclic number.

It is not a de Polignac number, because 863528009 - 2²⁰ = 862479433 is a prime.

Together with 863528011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (863528059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431764004 + 431764005.

It is an arithmetic number, because the mean of its divisors is an integer number (431764005).

Almost surely, 2^863528009 is an apocalyptic number.

It is an amenable number.

863528009 is a deficient number, since it is larger than the sum of its proper divisors (1).

863528009 is an equidigital number, since it uses as much as digits as its factorization.

863528009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 863528009 is about 29385.8470866504. The cubic root of 863528009 is about 952.2671646336.

The spelling of 863528009 in words is "eight hundred sixty-three million, five hundred twenty-eight thousand, nine".