1215234145 has 4 divisors (see below), whose sum is σ = 1458280980. Its totient is φ = 972187312.

The previous prime is 1215234143. The next prime is 1215234157. The reversal of 1215234145 is 5414325121.

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 136702864 + 1078531281 = 11692^2 + 32841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215234145 - 2¹ = 1215234143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215234143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121523410 + ... + 121523419.

It is an arithmetic number, because the mean of its divisors is an integer number (364570245).

Almost surely, 2^1215234145 is an apocalyptic number.

It is an amenable number.

1215234145 is a deficient number, since it is larger than the sum of its proper divisors (243046835).

1215234145 is an equidigital number, since it uses as much as digits as its factorization.

1215234145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243046834.

The product of its digits is 4800, while the sum is 28.

The square root of 1215234145 is about 34860.2086195708. The cubic root of 1215234145 is about 1067.1365325231.

Adding to 1215234145 its reverse (5414325121), we get a palindrome (6629559266).

The spelling of 1215234145 in words is "one billion, two hundred fifteen million, two hundred thirty-four thousand, one hundred forty-five".