11123120551 has 4 divisors (see below), whose sum is σ = 11606734512. Its totient is φ = 10639506592.

The previous prime is 11123120497. The next prime is 11123120599. The reversal of 11123120551 is 15502132111.

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 11123120551 - 2¹⁹ = 11122596263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123120851) 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, 241806946 + ... + 241806991.

It is an arithmetic number, because the mean of its divisors is an integer number (2901683628).

Almost surely, 2^11123120551 is an apocalyptic number.

11123120551 is a deficient number, since it is larger than the sum of its proper divisors (483613961).

11123120551 is an equidigital number, since it uses as much as digits as its factorization.

11123120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483613960.

The product of its (nonzero) digits is 300, while the sum is 22.

Adding to 11123120551 its reverse (15502132111), we get a palindrome (26625252662).

The spelling of 11123120551 in words is "eleven billion, one hundred twenty-three million, one hundred twenty thousand, five hundred fifty-one".