863904281 has 2 divisors, whose sum is σ = 863904282. Its totient is φ = 863904280.

The previous prime is 863904257. The next prime is 863904289. The reversal of 863904281 is 182409368.

863904281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548309056 + 315595225 = 23416^2 + 17765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863904281 is a prime.

It is a super-2 number, since 2×863904281² = 1492661213460253922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (863904289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431952140 + 431952141.

It is an arithmetic number, because the mean of its divisors is an integer number (431952141).

Almost surely, 2^863904281 is an apocalyptic number.

It is an amenable number.

863904281 is a deficient number, since it is larger than the sum of its proper divisors (1).

863904281 is an equidigital number, since it uses as much as digits as its factorization.

863904281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 863904281 is about 29392.2486550451. The cubic root of 863904281 is about 952.4054575576.

The spelling of 863904281 in words is "eight hundred sixty-three million, nine hundred four thousand, two hundred eighty-one".