1215134407 has 4 divisors (see below), whose sum is σ = 1215679360. Its totient is φ = 1214589456.

The previous prime is 1215134383. The next prime is 1215134419. The reversal of 1215134407 is 7044315121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7044315121 = 191 ⋅36881231.

It is a cyclic number.

It is not a de Polignac number, because 1215134407 - 2¹⁹ = 1214610119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215134447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269118 + ... + 273595.

It is an arithmetic number, because the mean of its divisors is an integer number (303919840).

Almost surely, 2^1215134407 is an apocalyptic number.

1215134407 is a deficient number, since it is larger than the sum of its proper divisors (544953).

1215134407 is an equidigital number, since it uses as much as digits as its factorization.

1215134407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544952.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1215134407 is about 34858.7780480039. The cubic root of 1215134407 is about 1067.1073373331.

Adding to 1215134407 its reverse (7044315121), we get a palindrome (8259449528).

The spelling of 1215134407 in words is "one billion, two hundred fifteen million, one hundred thirty-four thousand, four hundred seven".