1151117257 has 4 divisors (see below), whose sum is σ = 1152272836. Its totient is φ = 1149961680.

The previous prime is 1151117237. The next prime is 1151117263. The reversal of 1151117257 is 7527111511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7527111511 = 2957 ⋅2545523.

It can be written as a sum of positive squares in 2 ways, for example, as 1039159696 + 111957561 = 32236^2 + 10581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151117257 - 2¹⁵ = 1151084489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151117237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576294 + ... + 578287.

It is an arithmetic number, because the mean of its divisors is an integer number (288068209).

Almost surely, 2^1151117257 is an apocalyptic number.

It is an amenable number.

1151117257 is a deficient number, since it is larger than the sum of its proper divisors (1155579).

1151117257 is an equidigital number, since it uses as much as digits as its factorization.

1151117257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155578.

The product of its digits is 2450, while the sum is 31.

The square root of 1151117257 is about 33928.1189723215. The cubic root of 1151117257 is about 1048.0287298735.

Adding to 1151117257 its reverse (7527111511), we get a palindrome (8678228768).

The spelling of 1151117257 in words is "one billion, one hundred fifty-one million, one hundred seventeen thousand, two hundred fifty-seven".