1171271257 has 8 divisors (see below), whose sum is σ = 1264371080. Its totient is φ = 1078600320.

The previous prime is 1171271249. The next prime is 1171271261. The reversal of 1171271257 is 7521721711.

It can be written as a sum of positive squares in 4 ways, for example, as 181602576 + 989668681 = 13476^2 + 31459^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1171271257 - 2³ = 1171271249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171271237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101532 + ... + 112477.

It is an arithmetic number, because the mean of its divisors is an integer number (158046385).

Almost surely, 2^1171271257 is an apocalyptic number.

It is an amenable number.

1171271257 is a deficient number, since it is larger than the sum of its proper divisors (93099823).

1171271257 is a wasteful number, since it uses less digits than its factorization.

1171271257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214443.

The product of its digits is 6860, while the sum is 34.

The square root of 1171271257 is about 34223.8404770710. The cubic root of 1171271257 is about 1054.1097457459.

Adding to 1171271257 its reverse (7521721711), we get a palindrome (8692992968).

The spelling of 1171271257 in words is "one billion, one hundred seventy-one million, two hundred seventy-one thousand, two hundred fifty-seven".