1121112581 has 2 divisors, whose sum is σ = 1121112582. Its totient is φ = 1121112580.

The previous prime is 1121112571. The next prime is 1121112599. The reversal of 1121112581 is 1852111211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753777025 + 367335556 = 27455^2 + 19166^2 .

It is an emirp because it is prime and its reverse (1852111211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121112581 is a prime.

It is a super-2 number, since 2×1121112581² = 2513786838552963122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121112521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560556290 + 560556291.

It is an arithmetic number, because the mean of its divisors is an integer number (560556291).

Almost surely, 2^1121112581 is an apocalyptic number.

It is an amenable number.

1121112581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121112581 is an equidigital number, since it uses as much as digits as its factorization.

1121112581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 160, while the sum is 23.

The square root of 1121112581 is about 33483.0192933672. The cubic root of 1121112581 is about 1038.8425797989.

Adding to 1121112581 its reverse (1852111211), we get a palindrome (2973223792).

The spelling of 1121112581 in words is "one billion, one hundred twenty-one million, one hundred twelve thousand, five hundred eighty-one".