863478251 has 2 divisors, whose sum is σ = 863478252. Its totient is φ = 863478250.

The previous prime is 863478223. The next prime is 863478269. The reversal of 863478251 is 152874368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863478251 - 2¹⁰ = 863477227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (863478211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431739125 + 431739126.

It is an arithmetic number, because the mean of its divisors is an integer number (431739126).

Almost surely, 2^863478251 is an apocalyptic number.

863478251 is a deficient number, since it is larger than the sum of its proper divisors (1).

863478251 is an equidigital number, since it uses as much as digits as its factorization.

863478251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 44.

The square root of 863478251 is about 29385.0004424026. Note that the first 3 decimals coincide. The cubic root of 863478251 is about 952.2488738470.

The spelling of 863478251 in words is "eight hundred sixty-three million, four hundred seventy-eight thousand, two hundred fifty-one".