1215133513 has 4 divisors (see below), whose sum is σ = 1325600208. Its totient is φ = 1104666820.

The previous prime is 1215133501. The next prime is 1215133519. The reversal of 1215133513 is 3153315121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215133513 - 2²⁵ = 1181579081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215133519) 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, 55233331 + ... + 55233352.

It is an arithmetic number, because the mean of its divisors is an integer number (331400052).

Almost surely, 2^1215133513 is an apocalyptic number.

It is an amenable number.

1215133513 is a deficient number, since it is larger than the sum of its proper divisors (110466695).

1215133513 is a wasteful number, since it uses less digits than its factorization.

1215133513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110466694.

The product of its digits is 1350, while the sum is 25.

The square root of 1215133513 is about 34858.7652248326. The cubic root of 1215133513 is about 1067.1070756352.

Adding to 1215133513 its reverse (3153315121), we get a palindrome (4368448634).

The spelling of 1215133513 in words is "one billion, two hundred fifteen million, one hundred thirty-three thousand, five hundred thirteen".