1201305505 has 4 divisors (see below), whose sum is σ = 1441566612. Its totient is φ = 961044400.

The previous prime is 1201305499. The next prime is 1201305509. The reversal of 1201305505 is 5055031021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 491242896 + 710062609 = 22164^2 + 26647^2 .

It is not a de Polignac number, because 1201305505 - 2²⁵ = 1167751073 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201305509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120130546 + ... + 120130555.

It is an arithmetic number, because the mean of its divisors is an integer number (360391653).

Almost surely, 2^1201305505 is an apocalyptic number.

It is an amenable number.

1201305505 is a deficient number, since it is larger than the sum of its proper divisors (240261107).

1201305505 is an equidigital number, since it uses as much as digits as its factorization.

1201305505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240261106.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 1201305505 is about 34659.8543707269. The cubic root of 1201305505 is about 1063.0437923177.

Adding to 1201305505 its reverse (5055031021), we get a palindrome (6256336526).

The spelling of 1201305505 in words is "one billion, two hundred one million, three hundred five thousand, five hundred five".