1116641781 has 20 divisors (see below), whose sum is σ = 1725593100. Its totient is φ = 718756416.

The previous prime is 1116641777. The next prime is 1116641797. The reversal of 1116641781 is 1871466111.

1116641781 is a `hidden beast` number, since 1 + 1 + 1 + 6 + 641 + 7 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 909022500 + 207619281 = 30150^2 + 14409^2 .

It is not a de Polignac number, because 1116641781 - 2² = 1116641777 is a prime.

It is a super-2 number, since 2×1116641781² = 2493777734149703922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116641681) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 235336 + ... + 240033.

It is an arithmetic number, because the mean of its divisors is an integer number (86279655).

Almost surely, 2^1116641781 is an apocalyptic number.

It is an amenable number.

1116641781 is a deficient number, since it is larger than the sum of its proper divisors (608951319).

1116641781 is an equidigital number, since it uses as much as digits as its factorization.

1116641781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475410 (or 475401 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1116641781 is about 33416.1904022586. The cubic root of 1116641781 is about 1037.4598328863.

The spelling of 1116641781 in words is "one billion, one hundred sixteen million, six hundred forty-one thousand, seven hundred eighty-one".