1116788581 has 2 divisors, whose sum is σ = 1116788582. Its totient is φ = 1116788580.

The previous prime is 1116788539. The next prime is 1116788611. The reversal of 1116788581 is 1858876111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627051681 + 489736900 = 25041^2 + 22130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1116788581 - 2²¹ = 1114691429 is a prime.

It is a super-2 number, since 2×1116788581² = 2494433469303987122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1116783581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558394290 + 558394291.

It is an arithmetic number, because the mean of its divisors is an integer number (558394291).

Almost surely, 2^1116788581 is an apocalyptic number.

It is an amenable number.

1116788581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1116788581 is an equidigital number, since it uses as much as digits as its factorization.

1116788581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 46.

The square root of 1116788581 is about 33418.3868701049. The cubic root of 1116788581 is about 1037.5052943263.

The spelling of 1116788581 in words is "one billion, one hundred sixteen million, seven hundred eighty-eight thousand, five hundred eighty-one".