1118844561 has 16 divisors (see below), whose sum is σ = 1507334400. Its totient is φ = 738142848.

The previous prime is 1118844539. The next prime is 1118844589. The reversal of 1118844561 is 1654488111.

It is not a de Polignac number, because 1118844561 - 2⁹ = 1118844049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1118844521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357160 + ... + 360278.

It is an arithmetic number, because the mean of its divisors is an integer number (94208400).

Almost surely, 2^1118844561 is an apocalyptic number.

It is an amenable number.

1118844561 is a deficient number, since it is larger than the sum of its proper divisors (388489839).

1118844561 is a wasteful number, since it uses less digits than its factorization.

1118844561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328.

The product of its digits is 30720, while the sum is 39.

The square root of 1118844561 is about 33449.1339349766. The cubic root of 1118844561 is about 1038.1415778389.

The spelling of 1118844561 in words is "one billion, one hundred eighteen million, eight hundred forty-four thousand, five hundred sixty-one".