1328920949 has 2 divisors, whose sum is σ = 1328920950. Its totient is φ = 1328920948.

The previous prime is 1328920921. The next prime is 1328920963. The reversal of 1328920949 is 9490298231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721298449 + 607622500 = 26857^2 + 24650^2 .

It is an emirp because it is prime and its reverse (9490298231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1328920949 - 2¹⁶ = 1328855413 is a prime.

It is a super-3 number, since 3×1328920949³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328920909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664460474 + 664460475.

It is an arithmetic number, because the mean of its divisors is an integer number (664460475).

Almost surely, 2^1328920949 is an apocalyptic number.

It is an amenable number.

1328920949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328920949 is an equidigital number, since it uses as much as digits as its factorization.

1328920949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1328920949 is about 36454.3680373148. The cubic root of 1328920949 is about 1099.4269602072.

The spelling of 1328920949 in words is "one billion, three hundred twenty-eight million, nine hundred twenty thousand, nine hundred forty-nine".