1213105145 has 16 divisors (see below), whose sum is σ = 1678955520. Its totient is φ = 824209344.

The previous prime is 1213105133. The next prime is 1213105211. The reversal of 1213105145 is 5415013121.

It is not a de Polignac number, because 1213105145 - 2¹² = 1213101049 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213105145.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155177 + ... + 162806.

It is an arithmetic number, because the mean of its divisors is an integer number (104934720).

Almost surely, 2^1213105145 is an apocalyptic number.

It is an amenable number.

1213105145 is a deficient number, since it is larger than the sum of its proper divisors (465850375).

1213105145 is a wasteful number, since it uses less digits than its factorization.

1213105145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318104.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1213105145 is about 34829.6589848365. The cubic root of 1213105145 is about 1066.5129869200.

Adding to 1213105145 its reverse (5415013121), we get a palindrome (6628118266).

The spelling of 1213105145 in words is "one billion, two hundred thirteen million, one hundred five thousand, one hundred forty-five".