1320917289 has 24 divisors (see below), whose sum is σ = 1884212640. Its totient is φ = 820281600.

The previous prime is 1320917287. The next prime is 1320917291. The reversal of 1320917289 is 9827190231.

It is an interprime number because it is at equal distance from previous prime (1320917287) and next prime (1320917291).

It is not a de Polignac number, because 1320917289 - 2¹ = 1320917287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320917289.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320917287) 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 23 ways as a sum of consecutive naturals, for example, 518982 + ... + 521520.

It is an arithmetic number, because the mean of its divisors is an integer number (78508860).

Almost surely, 2^1320917289 is an apocalyptic number.

It is an amenable number.

1320917289 is a deficient number, since it is larger than the sum of its proper divisors (563295351).

1320917289 is a wasteful number, since it uses less digits than its factorization.

1320917289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761 (or 2660 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1320917289 is about 36344.4258312055. The cubic root of 1320917289 is about 1097.2153502723.

The spelling of 1320917289 in words is "one billion, three hundred twenty million, nine hundred seventeen thousand, two hundred eighty-nine".