1109564947 has 4 divisors (see below), whose sum is σ = 1109915856. Its totient is φ = 1109214040.

The previous prime is 1109564921. The next prime is 1109564987. The reversal of 1109564947 is 7494659011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1109564947 - 2¹¹ = 1109562899 is a prime.

It is a super-2 number, since 2×1109564947² = 2462268743222225618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1109564897 and 1109564906.

It is not an unprimeable number, because it can be changed into a prime (1109564987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170668 + ... + 177049.

It is an arithmetic number, because the mean of its divisors is an integer number (277478964).

Almost surely, 2^1109564947 is an apocalyptic number.

1109564947 is a deficient number, since it is larger than the sum of its proper divisors (350909).

1109564947 is an equidigital number, since it uses as much as digits as its factorization.

1109564947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350908.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1109564947 is about 33310.1327976939. The cubic root of 1109564947 is about 1035.2635164936.

The spelling of 1109564947 in words is "one billion, one hundred nine million, five hundred sixty-four thousand, nine hundred forty-seven".