1320117305 has 12 divisors (see below), whose sum is σ = 1715372460. Its totient is φ = 974855232.

The previous prime is 1320117259. The next prime is 1320117317. The reversal of 1320117305 is 5037110231.

It can be written as a sum of positive squares in 6 ways, for example, as 581147449 + 738969856 = 24107^2 + 27184^2 .

It is not a de Polignac number, because 1320117305 - 2²⁴ = 1303340089 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 780290 + ... + 781979.

It is an arithmetic number, because the mean of its divisors is an integer number (142947705).

Almost surely, 2^1320117305 is an apocalyptic number.

It is an amenable number.

1320117305 is a deficient number, since it is larger than the sum of its proper divisors (395255155).

1320117305 is a wasteful number, since it uses less digits than its factorization.

1320117305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562300 (or 1562287 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 1320117305 is about 36333.4185702364. The cubic root of 1320117305 is about 1096.9938042327.

Adding to 1320117305 its reverse (5037110231), we get a palindrome (6357227536).

The spelling of 1320117305 in words is "one billion, three hundred twenty million, one hundred seventeen thousand, three hundred five".