1201161265 has 16 divisors (see below), whose sum is σ = 1536440400. Its totient is φ = 898324480.

The previous prime is 1201161263. The next prime is 1201161307. The reversal of 1201161265 is 5621611021.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 954529 + 1200206736 = 977^2 + 34644^2 .

It is not a de Polignac number, because 1201161265 - 2¹ = 1201161263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201161263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34756 + ... + 60085.

It is an arithmetic number, because the mean of its divisors is an integer number (96027525).

Almost surely, 2^1201161265 is an apocalyptic number.

It is an amenable number.

1201161265 is a deficient number, since it is larger than the sum of its proper divisors (335279135).

1201161265 is a wasteful number, since it uses less digits than its factorization.

1201161265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95012.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1201161265 is about 34657.7735147542. The cubic root of 1201161265 is about 1063.0012442805.

Adding to 1201161265 its reverse (5621611021), we get a palindrome (6822772286).

The spelling of 1201161265 in words is "one billion, two hundred one million, one hundred sixty-one thousand, two hundred sixty-five".