1105643521 has 2 divisors, whose sum is σ = 1105643522. Its totient is φ = 1105643520.

The previous prime is 1105643503. The next prime is 1105643543. The reversal of 1105643521 is 1253465011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776402496 + 329241025 = 27864^2 + 18145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105643521 - 2⁷ = 1105643393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1105643521.

It is not a weakly prime, because it can be changed into another prime (1105643221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 552821760 + 552821761.

It is an arithmetic number, because the mean of its divisors is an integer number (552821761).

Almost surely, 2^1105643521 is an apocalyptic number.

It is an amenable number.

1105643521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1105643521 is an equidigital number, since it uses as much as digits as its factorization.

1105643521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1105643521 is about 33251.2183385812. The cubic root of 1105643521 is about 1034.0424669570.

The spelling of 1105643521 in words is "one billion, one hundred five million, six hundred forty-three thousand, five hundred twenty-one".