1211563265 has 8 divisors (see below), whose sum is σ = 1586046528. Its totient is φ = 881136880.

The previous prime is 1211563229. The next prime is 1211563267. The reversal of 1211563265 is 5623651121.

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

It is not a de Polignac number, because 1211563265 - 2¹² = 1211559169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211563267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11014157 + ... + 11014266.

It is an arithmetic number, because the mean of its divisors is an integer number (198255816).

Almost surely, 2^1211563265 is an apocalyptic number.

It is an amenable number.

1211563265 is a deficient number, since it is larger than the sum of its proper divisors (374483263).

1211563265 is a wasteful number, since it uses less digits than its factorization.

1211563265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22028439.

The product of its digits is 10800, while the sum is 32.

The square root of 1211563265 is about 34807.5173633513. The cubic root of 1211563265 is about 1066.0609424988.

It can be divided in two parts, 121156 and 3265, that added together give a palindrome (124421).

The spelling of 1211563265 in words is "one billion, two hundred eleven million, five hundred sixty-three thousand, two hundred sixty-five".