1210813145 has 4 divisors (see below), whose sum is σ = 1452975780. Its totient is φ = 968650512.

The previous prime is 1210813141. The next prime is 1210813147. The reversal of 1210813145 is 5413180121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5413180121 = 3677 ⋅1472173.

It can be written as a sum of positive squares in 2 ways, for example, as 428324416 + 782488729 = 20696^2 + 27973^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210813145 - 2² = 1210813141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210813141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121081310 + ... + 121081319.

It is an arithmetic number, because the mean of its divisors is an integer number (363243945).

Almost surely, 2^1210813145 is an apocalyptic number.

It is an amenable number.

1210813145 is a deficient number, since it is larger than the sum of its proper divisors (242162635).

1210813145 is an equidigital number, since it uses as much as digits as its factorization.

1210813145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242162634.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 1210813145 is about 34796.7404364259. The cubic root of 1210813145 is about 1065.8408855555.

Adding to 1210813145 its reverse (5413180121), we get a palindrome (6623993266).

The spelling of 1210813145 in words is "one billion, two hundred ten million, eight hundred thirteen thousand, one hundred forty-five".