1101605563 has 4 divisors (see below), whose sum is σ = 1102240048. Its totient is φ = 1100971080.

The previous prime is 1101605543. The next prime is 1101605597. The reversal of 1101605563 is 3655061011.

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 1101605563 - 2²¹ = 1099508411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1101605543) 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, 314631 + ... + 318112.

It is an arithmetic number, because the mean of its divisors is an integer number (275560012).

Almost surely, 2^1101605563 is an apocalyptic number.

1101605563 is a deficient number, since it is larger than the sum of its proper divisors (634485).

1101605563 is an equidigital number, since it uses as much as digits as its factorization.

1101605563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634484.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1101605563 is about 33190.4438506025. The cubic root of 1101605563 is about 1032.7821109215.

Adding to 1101605563 its reverse (3655061011), we get a palindrome (4756666574).

The spelling of 1101605563 in words is "one billion, one hundred one million, six hundred five thousand, five hundred sixty-three".