1171305257 has 2 divisors, whose sum is σ = 1171305258. Its totient is φ = 1171305256.

The previous prime is 1171305193. The next prime is 1171305281. The reversal of 1171305257 is 7525031711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984955456 + 186349801 = 31384^2 + 13651^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171305257 - 2⁶ = 1171305193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171305557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585652628 + 585652629.

It is an arithmetic number, because the mean of its divisors is an integer number (585652629).

Almost surely, 2^1171305257 is an apocalyptic number.

It is an amenable number.

1171305257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171305257 is an equidigital number, since it uses as much as digits as its factorization.

1171305257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 1171305257 is about 34224.3372032243. The cubic root of 1171305257 is about 1054.1199453145.

Adding to 1171305257 its reverse (7525031711), we get a palindrome (8696336968).

The spelling of 1171305257 in words is "one billion, one hundred seventy-one million, three hundred five thousand, two hundred fifty-seven".