1201135505 has 8 divisors (see below), whose sum is σ = 1444693992. Its totient is φ = 958687488.

The previous prime is 1201135487. The next prime is 1201135541. The reversal of 1201135505 is 5055311021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16192576 + 1184942929 = 4024^2 + 34423^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201135505 - 2²⁰ = 1200086929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275234 + ... + 279563.

It is an arithmetic number, because the mean of its divisors is an integer number (180586749).

Almost surely, 2^1201135505 is an apocalyptic number.

It is an amenable number.

1201135505 is a deficient number, since it is larger than the sum of its proper divisors (243558487).

1201135505 is an equidigital number, since it uses as much as digits as its factorization.

1201135505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555235.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1201135505 is about 34657.4018789637. The cubic root of 1201135505 is about 1062.9936452154.

Adding to 1201135505 its reverse (5055311021), we get a palindrome (6256446526).

The spelling of 1201135505 in words is "one billion, two hundred one million, one hundred thirty-five thousand, five hundred five".