1311117778 has 16 divisors (see below), whose sum is σ = 1984580640. Its totient is φ = 649609056.

The previous prime is 1311117767. The next prime is 1311117793. The reversal of 1311117778 is 8777111131.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152326 + ... + 160702.

It is an arithmetic number, because the mean of its divisors is an integer number (124036290).

Almost surely, 2^1311117778 is an apocalyptic number.

1311117778 is a deficient number, since it is larger than the sum of its proper divisors (673462862).

1311117778 is a wasteful number, since it uses less digits than its factorization.

1311117778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9081.

The product of its digits is 8232, while the sum is 37.

The square root of 1311117778 is about 36209.3603644141. The cubic root of 1311117778 is about 1094.4953028157.

The spelling of 1311117778 in words is "one billion, three hundred eleven million, one hundred seventeen thousand, seven hundred seventy-eight".