1320211645 has 8 divisors (see below), whose sum is σ = 1584736056. Its totient is φ = 1055847936.

The previous prime is 1320211621. The next prime is 1320211693. The reversal of 1320211645 is 5461120231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 119311929 + 1200899716 = 10923^2 + 34654^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320211645 - 2²⁷ = 1185993917 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 21292 + ... + 55621.

It is an arithmetic number, because the mean of its divisors is an integer number (198092007).

Almost surely, 2^1320211645 is an apocalyptic number.

It is an amenable number.

1320211645 is a deficient number, since it is larger than the sum of its proper divisors (264524411).

1320211645 is an equidigital number, since it uses as much as digits as its factorization.

1320211645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80351.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1320211645 is about 36334.7168008779. The cubic root of 1320211645 is about 1097.0199352263.

Adding to 1320211645 its reverse (5461120231), we get a palindrome (6781331876).

The spelling of 1320211645 in words is "one billion, three hundred twenty million, two hundred eleven thousand, six hundred forty-five".