11185215497 has 4 divisors (see below), whose sum is σ = 11185751760. Its totient is φ = 11184679236.

The previous prime is 11185215473. The next prime is 11185215541. The reversal of 11185215497 is 79451258111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79451258111 = 43 ⋅1847703677.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11185215497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11185214497) 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, 235523 + ... + 279000.

It is an arithmetic number, because the mean of its divisors is an integer number (2796437940).

Almost surely, 2^11185215497 is an apocalyptic number.

It is an amenable number.

11185215497 is a deficient number, since it is larger than the sum of its proper divisors (536263).

11185215497 is an equidigital number, since it uses as much as digits as its factorization.

11185215497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536262.

The product of its digits is 100800, while the sum is 44.

The spelling of 11185215497 in words is "eleven billion, one hundred eighty-five million, two hundred fifteen thousand, four hundred ninety-seven".