11217531513 has 4 divisors (see below), whose sum is σ = 14956708688. Its totient is φ = 7478354340.

The previous prime is 11217531491. The next prime is 11217531541. The reversal of 11217531513 is 31513571211.

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 not a de Polignac number, because 11217531513 - 2¹⁶ = 11217465977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11217531553) 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, 1869588583 + ... + 1869588588.

It is an arithmetic number, because the mean of its divisors is an integer number (3739177172).

Almost surely, 2^11217531513 is an apocalyptic number.

It is an amenable number.

11217531513 is a deficient number, since it is larger than the sum of its proper divisors (3739177175).

11217531513 is an equidigital number, since it uses as much as digits as its factorization.

11217531513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739177174.

The product of its digits is 3150, while the sum is 30.

The spelling of 11217531513 in words is "eleven billion, two hundred seventeen million, five hundred thirty-one thousand, five hundred thirteen".