8731118857 has 2 divisors, whose sum is σ = 8731118858. Its totient is φ = 8731118856.

The previous prime is 8731118839. The next prime is 8731118861. The reversal of 8731118857 is 7588111378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8586060921 + 145057936 = 92661^2 + 12044^2 .

It is a cyclic number.

It is not a de Polignac number, because 8731118857 - 2³¹ = 6583635209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8731118857.

It is not a weakly prime, because it can be changed into another prime (8731118897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4365559428 + 4365559429.

It is an arithmetic number, because the mean of its divisors is an integer number (4365559429).

Almost surely, 2^8731118857 is an apocalyptic number.

It is an amenable number.

8731118857 is a deficient number, since it is larger than the sum of its proper divisors (1).

8731118857 is an equidigital number, since it uses as much as digits as its factorization.

8731118857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 49.

The square root of 8731118857 is about 93440.4562114291. The cubic root of 8731118857 is about 2059.1594000970.

The spelling of 8731118857 in words is "eight billion, seven hundred thirty-one million, one hundred eighteen thousand, eight hundred fifty-seven".