1311188849 has 4 divisors (see below), whose sum is σ = 1313216064. Its totient is φ = 1309161636.

The previous prime is 1311188831. The next prime is 1311188863. The reversal of 1311188849 is 9488811131.

It is a happy number.

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: 9488811131 = 81031 ⋅117101.

It is a cyclic number.

It is not a de Polignac number, because 1311188849 - 2¹⁶ = 1311123313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311188819) 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, 1012637 + ... + 1013930.

It is an arithmetic number, because the mean of its divisors is an integer number (328304016).

Almost surely, 2^1311188849 is an apocalyptic number.

It is an amenable number.

1311188849 is a deficient number, since it is larger than the sum of its proper divisors (2027215).

1311188849 is an equidigital number, since it uses as much as digits as its factorization.

1311188849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027214.

The product of its digits is 55296, while the sum is 44.

The square root of 1311188849 is about 36210.3417409999. The cubic root of 1311188849 is about 1094.5150786822.

The spelling of 1311188849 in words is "one billion, three hundred eleven million, one hundred eighty-eight thousand, eight hundred forty-nine".