11123142515 has 4 divisors (see below), whose sum is σ = 13347771024. Its totient is φ = 8898514008.

The previous prime is 11123142491. The next prime is 11123142523. The reversal of 11123142515 is 51524132111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51524132111 = 23 ⋅2240179657.

It is a cyclic number.

It is not a de Polignac number, because 11123142515 - 2⁶ = 11123142451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112314247 + ... + 1112314256.

It is an arithmetic number, because the mean of its divisors is an integer number (3336942756).

Almost surely, 2^11123142515 is an apocalyptic number.

11123142515 is a deficient number, since it is larger than the sum of its proper divisors (2224628509).

11123142515 is an equidigital number, since it uses as much as digits as its factorization.

11123142515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224628508.

The product of its digits is 1200, while the sum is 26.

Adding to 11123142515 its reverse (51524132111), we get a palindrome (62647274626).

The spelling of 11123142515 in words is "eleven billion, one hundred twenty-three million, one hundred forty-two thousand, five hundred fifteen".