7857151117 has 2 divisors, whose sum is σ = 7857151118. Its totient is φ = 7857151116.

The previous prime is 7857151079. The next prime is 7857151129. The reversal of 7857151117 is 7111517587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5858524681 + 1998626436 = 76541^2 + 44706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7857151117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7857151217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3928575558 + 3928575559.

It is an arithmetic number, because the mean of its divisors is an integer number (3928575559).

Almost surely, 2^7857151117 is an apocalyptic number.

It is an amenable number.

7857151117 is a deficient number, since it is larger than the sum of its proper divisors (1).

7857151117 is an equidigital number, since it uses as much as digits as its factorization.

7857151117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68600, while the sum is 43.

The square root of 7857151117 is about 88640.5726346575. The cubic root of 7857151117 is about 1988.0243615837.

The spelling of 7857151117 in words is "seven billion, eight hundred fifty-seven million, one hundred fifty-one thousand, one hundred seventeen".