1117242557 has 2 divisors, whose sum is σ = 1117242558. Its totient is φ = 1117242556.

The previous prime is 1117242551. The next prime is 1117242559. The reversal of 1117242557 is 7552427111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611622361 + 505620196 = 24731^2 + 22486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117242557 - 2¹⁰ = 1117241533 is a prime.

Together with 1117242559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1117242551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558621278 + 558621279.

It is an arithmetic number, because the mean of its divisors is an integer number (558621279).

Almost surely, 2^1117242557 is an apocalyptic number.

It is an amenable number.

1117242557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117242557 is an equidigital number, since it uses as much as digits as its factorization.

1117242557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 35.

The square root of 1117242557 is about 33425.1784886783. The cubic root of 1117242557 is about 1037.6458576955.

Adding to 1117242557 its reverse (7552427111), we get a palindrome (8669669668).

The spelling of 1117242557 in words is "one billion, one hundred seventeen million, two hundred forty-two thousand, five hundred fifty-seven".