1213030145 has 4 divisors (see below), whose sum is σ = 1455636180. Its totient is φ = 970424112.

The previous prime is 1213030139. The next prime is 1213030177. The reversal of 1213030145 is 5410303121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 866772481 + 346257664 = 29441^2 + 18608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213030145 - 2⁸ = 1213029889 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 121303010 + ... + 121303019.

It is an arithmetic number, because the mean of its divisors is an integer number (363909045).

Almost surely, 2^1213030145 is an apocalyptic number.

It is an amenable number.

1213030145 is a deficient number, since it is larger than the sum of its proper divisors (242606035).

1213030145 is an equidigital number, since it uses as much as digits as its factorization.

1213030145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242606034.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1213030145 is about 34828.5822995999. The cubic root of 1213030145 is about 1066.4910074780.

Adding to 1213030145 its reverse (5410303121), we get a palindrome (6623333266).

The spelling of 1213030145 in words is "one billion, two hundred thirteen million, thirty thousand, one hundred forty-five".