863948191 has 2 divisors, whose sum is σ = 863948192. Its totient is φ = 863948190.

The previous prime is 863948179. The next prime is 863948209. The reversal of 863948191 is 191849368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 863948191 - 2⁵ = 863948159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863948291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431974095 + 431974096.

It is an arithmetic number, because the mean of its divisors is an integer number (431974096).

Almost surely, 2^863948191 is an apocalyptic number.

863948191 is a deficient number, since it is larger than the sum of its proper divisors (1).

863948191 is an equidigital number, since it uses as much as digits as its factorization.

863948191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 863948191 is about 29392.9956111996. The cubic root of 863948191 is about 952.4215933788.

The spelling of 863948191 in words is "eight hundred sixty-three million, nine hundred forty-eight thousand, one hundred ninety-one".