1109640681 has 16 divisors (see below), whose sum is σ = 1715387520. Its totient is φ = 707596560.

The previous prime is 1109640673. The next prime is 1109640683. The reversal of 1109640681 is 1860469011.

It is a happy number.

1109640681 is a `hidden beast` number, since 1 + 1 + 0 + 9 + 640 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 1109640681 - 2³ = 1109640673 is a prime.

It is a super-2 number, since 2×1109640681² = 2462604881860287522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1109640683) 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, 892810 + ... + 894051.

It is an arithmetic number, because the mean of its divisors is an integer number (107211720).

Almost surely, 2^1109640681 is an apocalyptic number.

It is an amenable number.

1109640681 is a deficient number, since it is larger than the sum of its proper divisors (605746839).

1109640681 is a wasteful number, since it uses less digits than its factorization.

1109640681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786893 (or 1786887 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1109640681 is about 33311.2695795282. The cubic root of 1109640681 is about 1035.2870701286.

The spelling of 1109640681 in words is "one billion, one hundred nine million, six hundred forty thousand, six hundred eighty-one".