863942791 has 2 divisors, whose sum is σ = 863942792. Its totient is φ = 863942790.

The previous prime is 863942777. The next prime is 863942837. The reversal of 863942791 is 197249368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 863942791 - 2⁹ = 863942279 is a prime.

It is a super-3 number, since 3×863942791³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863942731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431971395 + 431971396.

It is an arithmetic number, because the mean of its divisors is an integer number (431971396).

Almost surely, 2^863942791 is an apocalyptic number.

863942791 is a deficient number, since it is larger than the sum of its proper divisors (1).

863942791 is an equidigital number, since it uses as much as digits as its factorization.

863942791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 863942791 is about 29392.9037524366. The cubic root of 863942791 is about 952.4196090441.

The spelling of 863942791 in words is "eight hundred sixty-three million, nine hundred forty-two thousand, seven hundred ninety-one".