11125551 has 8 divisors (see below), whose sum is σ = 15055744. Its totient is φ = 7306200.

The previous prime is 11125549. The next prime is 11125553. The reversal of 11125551 is 15552111.

11125551 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11125549) and next prime (11125553).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11125551 - 2¹ = 11125549 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 (11125553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27475 + ... + 27876.

It is an arithmetic number, because the mean of its divisors is an integer number (1881968).

Almost surely, 2^11125551 is an apocalyptic number.

11125551 is a deficient number, since it is larger than the sum of its proper divisors (3930193).

11125551 is an equidigital number, since it uses as much as digits as its factorization.

11125551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55421.

The product of its digits is 250, while the sum is 21.

The square root of 11125551 is about 3335.4986134010. The cubic root of 11125551 is about 223.2409402233.

Adding to 11125551 its reverse (15552111), we get a palindrome (26677662).

The spelling of 11125551 in words is "eleven million, one hundred twenty-five thousand, five hundred fifty-one".