1311336661 has 8 divisors (see below), whose sum is σ = 1414022400. Its totient is φ = 1212017760.

The previous prime is 1311336629. The next prime is 1311336679. The reversal of 1311336661 is 1666331131.

It is a happy number.

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 1311336661 - 2⁵ = 1311336629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311336601) 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, 840901 + ... + 842458.

It is an arithmetic number, because the mean of its divisors is an integer number (176752800).

Almost surely, 2^1311336661 is an apocalyptic number.

It is an amenable number.

1311336661 is a deficient number, since it is larger than the sum of its proper divisors (102685739).

1311336661 is a wasteful number, since it uses less digits than its factorization.

1311336661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683419.

The product of its digits is 5832, while the sum is 31.

The square root of 1311336661 is about 36212.3827026060. The cubic root of 1311336661 is about 1094.5562058328.

Adding to 1311336661 its reverse (1666331131), we get a palindrome (2977667792).

The spelling of 1311336661 in words is "one billion, three hundred eleven million, three hundred thirty-six thousand, six hundred sixty-one".