1245820113 has 6 divisors (see below), whose sum is σ = 1799517954. Its totient is φ = 830546736.

The previous prime is 1245820111. The next prime is 1245820127. The reversal of 1245820113 is 3110285421.

1245820113 is a `hidden beast` number, since 1 + 2 + 458 + 201 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1245525264 + 294849 = 35292^2 + 543^2 .

It is not a de Polignac number, because 1245820113 - 2¹ = 1245820111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245820111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69212220 + ... + 69212237.

It is an arithmetic number, because the mean of its divisors is an integer number (299919659).

Almost surely, 2^1245820113 is an apocalyptic number.

It is an amenable number.

1245820113 is a deficient number, since it is larger than the sum of its proper divisors (553697841).

1245820113 is a wasteful number, since it uses less digits than its factorization.

1245820113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138424463 (or 138424460 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1245820113 is about 35296.1770309477. The cubic root of 1245820113 is about 1076.0152983664.

The spelling of 1245820113 in words is "one billion, two hundred forty-five million, eight hundred twenty thousand, one hundred thirteen".