1201165265 has 4 divisors (see below), whose sum is σ = 1441398324. Its totient is φ = 960932208.

The previous prime is 1201165261. The next prime is 1201165283. The reversal of 1201165265 is 5625611021.

It is a happy number.

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 707081281 + 494083984 = 26591^2 + 22228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201165265 - 2² = 1201165261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201165261) 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, 120116522 + ... + 120116531.

It is an arithmetic number, because the mean of its divisors is an integer number (360349581).

Almost surely, 2^1201165265 is an apocalyptic number.

It is an amenable number.

1201165265 is a deficient number, since it is larger than the sum of its proper divisors (240233059).

1201165265 is an equidigital number, since it uses as much as digits as its factorization.

1201165265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240233058.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1201165265 is about 34657.8312218177. The cubic root of 1201165265 is about 1063.0024242498.

Adding to 1201165265 its reverse (5625611021), we get a palindrome (6826776286).

The spelling of 1201165265 in words is "one billion, two hundred one million, one hundred sixty-five thousand, two hundred sixty-five".