1311611345 has 8 divisors (see below), whose sum is σ = 1717018560. Its totient is φ = 953899120.

The previous prime is 1311611311. The next prime is 1311611347. The reversal of 1311611345 is 5431161131.

It is a happy number.

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

It is not a de Polignac number, because 1311611345 - 2²⁶ = 1244502481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311611347) 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, 11923685 + ... + 11923794.

It is an arithmetic number, because the mean of its divisors is an integer number (214627320).

Almost surely, 2^1311611345 is an apocalyptic number.

It is an amenable number.

1311611345 is a deficient number, since it is larger than the sum of its proper divisors (405407215).

1311611345 is a wasteful number, since it uses less digits than its factorization.

1311611345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23847495.

The product of its digits is 1080, while the sum is 26.

The square root of 1311611345 is about 36216.1751845774. The cubic root of 1311611345 is about 1094.6326255897.

Adding to 1311611345 its reverse (5431161131), we get a palindrome (6742772476).

The spelling of 1311611345 in words is "one billion, three hundred eleven million, six hundred eleven thousand, three hundred forty-five".