1311232569 has 4 divisors (see below), whose sum is σ = 1748310096. Its totient is φ = 874155044.

The previous prime is 1311232519. The next prime is 1311232577. The reversal of 1311232569 is 9652321131.

1311232569 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9652321131 = 3 ⋅3217440377.

It is a cyclic number.

It is not a de Polignac number, because 1311232569 - 2⁹ = 1311232057 is a prime.

It is a super-2 number, since 2×1311232569² = 3438661700012679522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311232519) 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, 218538759 + ... + 218538764.

It is an arithmetic number, because the mean of its divisors is an integer number (437077524).

Almost surely, 2^1311232569 is an apocalyptic number.

It is an amenable number.

1311232569 is a deficient number, since it is larger than the sum of its proper divisors (437077527).

1311232569 is an equidigital number, since it uses as much as digits as its factorization.

1311232569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437077526.

The product of its digits is 9720, while the sum is 33.

The square root of 1311232569 is about 36210.9454309053. The cubic root of 1311232569 is about 1094.5272436390.

The spelling of 1311232569 in words is "one billion, three hundred eleven million, two hundred thirty-two thousand, five hundred sixty-nine".