863471521 has 16 divisors (see below), whose sum is σ = 978199488. Its totient is φ = 755308800.

The previous prime is 863471509. The next prime is 863471561. The reversal of 863471521 is 125174368.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863471521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863471561) 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 in 15 ways as a sum of consecutive naturals, for example, 19810 + ... + 46036.

It is an arithmetic number, because the mean of its divisors is an integer number (61137468).

It is a Poulet number, since it divides 2^863471520-1.

Almost surely, 2^863471521 is an apocalyptic number.

It is an amenable number.

863471521 is a deficient number, since it is larger than the sum of its proper divisors (114727967).

863471521 is a wasteful number, since it uses less digits than its factorization.

863471521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26352.

The product of its digits is 40320, while the sum is 37.

The square root of 863471521 is about 29384.8859279732. The cubic root of 863471521 is about 952.2463998794.

The spelling of 863471521 in words is "eight hundred sixty-three million, four hundred seventy-one thousand, five hundred twenty-one".