863524721 has 2 divisors, whose sum is σ = 863524722. Its totient is φ = 863524720.

The previous prime is 863524709. The next prime is 863524733. The reversal of 863524721 is 127425368.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (863524709) and next prime (863524733).

It can be written as a sum of positive squares in only one way, i.e., 456292321 + 407232400 = 21361^2 + 20180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863524721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (863524771) 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 as a sum of consecutive naturals, namely, 431762360 + 431762361.

It is an arithmetic number, because the mean of its divisors is an integer number (431762361).

Almost surely, 2^863524721 is an apocalyptic number.

It is an amenable number.

863524721 is a deficient number, since it is larger than the sum of its proper divisors (1).

863524721 is an equidigital number, since it uses as much as digits as its factorization.

863524721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 38.

The square root of 863524721 is about 29385.7911412982. The cubic root of 863524721 is about 952.2659560033.

The spelling of 863524721 in words is "eight hundred sixty-three million, five hundred twenty-four thousand, seven hundred twenty-one".