1331566913 has 2 divisors, whose sum is σ = 1331566914. Its totient is φ = 1331566912.

The previous prime is 1331566897. The next prime is 1331566937. The reversal of 1331566913 is 3196651331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831284224 + 500282689 = 28832^2 + 22367^2 .

It is an emirp because it is prime and its reverse (3196651331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331566913 - 2⁴ = 1331566897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331566993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665783456 + 665783457.

It is an arithmetic number, because the mean of its divisors is an integer number (665783457).

Almost surely, 2^1331566913 is an apocalyptic number.

It is an amenable number.

1331566913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331566913 is an equidigital number, since it uses as much as digits as its factorization.

1331566913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 1331566913 is about 36490.6414440744. The cubic root of 1331566913 is about 1100.1561522123.

The spelling of 1331566913 in words is "one billion, three hundred thirty-one million, five hundred sixty-six thousand, nine hundred thirteen".