1320352181 has 2 divisors, whose sum is σ = 1320352182. Its totient is φ = 1320352180.

The previous prime is 1320352177. The next prime is 1320352213. The reversal of 1320352181 is 1812530231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1025920900 + 294431281 = 32030^2 + 17159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320352181 - 2² = 1320352177 is a prime.

It is a super-4 number, since 4×1320352181⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1320352181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320352171) 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, 660176090 + 660176091.

It is an arithmetic number, because the mean of its divisors is an integer number (660176091).

Almost surely, 2^1320352181 is an apocalyptic number.

It is an amenable number.

1320352181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320352181 is an equidigital number, since it uses as much as digits as its factorization.

1320352181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1320352181 is about 36336.6506574285. The cubic root of 1320352181 is about 1097.0588596225.

The spelling of 1320352181 in words is "one billion, three hundred twenty million, three hundred fifty-two thousand, one hundred eighty-one".