1118581641 has 12 divisors (see below), whose sum is σ = 1638486720. Its totient is φ = 735217560.

The previous prime is 1118581601. The next prime is 1118581643. The reversal of 1118581641 is 1461858111.

1118581641 is a `hidden beast` number, since 1 + 1 + 1 + 8 + 5 + 8 + 1 + 641 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1118581641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1118581596 and 1118581605.

It is not an unprimeable number, because it can be changed into a prime (1118581643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 874621 + ... + 875898.

It is an arithmetic number, because the mean of its divisors is an integer number (136540560).

Almost surely, 2^1118581641 is an apocalyptic number.

It is an amenable number.

1118581641 is a deficient number, since it is larger than the sum of its proper divisors (519905079).

1118581641 is a wasteful number, since it uses less digits than its factorization.

1118581641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750596 (or 1750593 counting only the distinct ones).

The product of its digits is 7680, while the sum is 36.

The square root of 1118581641 is about 33445.2035574610. The cubic root of 1118581641 is about 1038.0602529983.

The spelling of 1118581641 in words is "one billion, one hundred eighteen million, five hundred eighty-one thousand, six hundred forty-one".