1320636245 has 16 divisors (see below), whose sum is σ = 1709650800. Its totient is φ = 975596544.

The previous prime is 1320636223. The next prime is 1320636257. The reversal of 1320636245 is 5426360231.

It can be written as a sum of positive squares in 8 ways, for example, as 65918161 + 1254718084 = 8119^2 + 35422^2 .

It is not a de Polignac number, because 1320636245 - 2⁶ = 1320636181 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 142070 + ... + 151079.

It is an arithmetic number, because the mean of its divisors is an integer number (106853175).

Almost surely, 2^1320636245 is an apocalyptic number.

It is an amenable number.

1320636245 is a deficient number, since it is larger than the sum of its proper divisors (389014555).

1320636245 is a wasteful number, since it uses less digits than its factorization.

1320636245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293224.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1320636245 is about 36340.5592279480. The cubic root of 1320636245 is about 1097.1375286792.

Adding to 1320636245 its reverse (5426360231), we get a palindrome (6746996476).

The spelling of 1320636245 in words is "one billion, three hundred twenty million, six hundred thirty-six thousand, two hundred forty-five".