1131172517 has 2 divisors, whose sum is σ = 1131172518. Its totient is φ = 1131172516.

The previous prime is 1131172513. The next prime is 1131172531. The reversal of 1131172517 is 7152711311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1051445476 + 79727041 = 32426^2 + 8929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131172517 - 2² = 1131172513 is a prime.

It is a super-2 number, since 2×1131172517² = 2559102526432230578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131172517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131172513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565586258 + 565586259.

It is an arithmetic number, because the mean of its divisors is an integer number (565586259).

Almost surely, 2^1131172517 is an apocalyptic number.

It is an amenable number.

1131172517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131172517 is an equidigital number, since it uses as much as digits as its factorization.

1131172517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1470, while the sum is 29.

The square root of 1131172517 is about 33632.9082447534. The cubic root of 1131172517 is about 1041.9405696386.

Adding to 1131172517 its reverse (7152711311), we get a palindrome (8283883828).

The spelling of 1131172517 in words is "one billion, one hundred thirty-one million, one hundred seventy-two thousand, five hundred seventeen".