1109999644 has 12 divisors (see below), whose sum is σ = 2091922504. Its totient is φ = 512307504.

The previous prime is 1109999623. The next prime is 1109999677. The reversal of 1109999644 is 4469999011.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 21346147 = 1109999644 / (1 + 1 + 0 + 9 + 9 + 9 + 9 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 1109999591 and 1109999600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10673022 + ... + 10673125.

Almost surely, 2^1109999644 is an apocalyptic number.

It is an amenable number.

1109999644 is a deficient number, since it is larger than the sum of its proper divisors (981922860).

1109999644 is a wasteful number, since it uses less digits than its factorization.

1109999644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21346164 (or 21346162 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 1109999644 is about 33316.6571552429. The cubic root of 1109999644 is about 1035.3986947571.

The spelling of 1109999644 in words is "one billion, one hundred nine million, nine hundred ninety-nine thousand, six hundred forty-four".