11123551 has 2 divisors, whose sum is σ = 11123552. Its totient is φ = 11123550.

The previous prime is 11123527. The next prime is 11123557. The reversal of 11123551 is 15532111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11123551 - 2⁹ = 11123039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561775 + 5561776.

It is an arithmetic number, because the mean of its divisors is an integer number (5561776).

Almost surely, 2^11123551 is an apocalyptic number.

11123551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123551 is an equidigital number, since it uses as much as digits as its factorization.

11123551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 11123551 is about 3335.1987946748. The cubic root of 11123551 is about 223.2275623500.

Adding to 11123551 its reverse (15532111), we get a palindrome (26655662).

The spelling of 11123551 in words is "eleven million, one hundred twenty-three thousand, five hundred fifty-one".