1311999977 has 8 divisors (see below), whose sum is σ = 1322861760. Its totient is φ = 1301151280.

The previous prime is 1311999967. The next prime is 1311999979. The reversal of 1311999977 is 7799991131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311999977 - 2¹⁴ = 1311983593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311999979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350924 + ... + 354642.

It is an arithmetic number, because the mean of its divisors is an integer number (165357720).

Almost surely, 2^1311999977 is an apocalyptic number.

It is an amenable number.

1311999977 is a deficient number, since it is larger than the sum of its proper divisors (10861783).

1311999977 is a wasteful number, since it uses less digits than its factorization.

1311999977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6543.

The product of its digits is 964467, while the sum is 56.

The square root of 1311999977 is about 36221.5402350590. The cubic root of 1311999977 is about 1094.7407285626.

The spelling of 1311999977 in words is "one billion, three hundred eleven million, nine hundred ninety-nine thousand, nine hundred seventy-seven".