11111242015 has 4 divisors (see below), whose sum is σ = 13333490424. Its totient is φ = 8888993608.

The previous prime is 11111242001. The next prime is 11111242031. The reversal of 11111242015 is 51024211111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111242015 - 2⁷ = 11111241887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111241983 and 11111242001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111124197 + ... + 1111124206.

It is an arithmetic number, because the mean of its divisors is an integer number (3333372606).

Almost surely, 2^11111242015 is an apocalyptic number.

11111242015 is a deficient number, since it is larger than the sum of its proper divisors (2222248409).

11111242015 is an equidigital number, since it uses as much as digits as its factorization.

11111242015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222248408.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 11111242015 its reverse (51024211111), we get a palindrome (62135453126).

The spelling of 11111242015 in words is "eleven billion, one hundred eleven million, two hundred forty-two thousand, fifteen".