861248711 has 2 divisors, whose sum is σ = 861248712. Its totient is φ = 861248710.

The previous prime is 861248693. The next prime is 861248743. The reversal of 861248711 is 117842168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861248711 - 2¹⁰ = 861247687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861248761) 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 as a sum of consecutive naturals, namely, 430624355 + 430624356.

It is an arithmetic number, because the mean of its divisors is an integer number (430624356).

Almost surely, 2^861248711 is an apocalyptic number.

861248711 is a deficient number, since it is larger than the sum of its proper divisors (1).

861248711 is an equidigital number, since it uses as much as digits as its factorization.

861248711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 38.

The square root of 861248711 is about 29347.0392203370. The cubic root of 861248711 is about 951.4285841751.

The spelling of 861248711 in words is "eight hundred sixty-one million, two hundred forty-eight thousand, seven hundred eleven".