1123551 has 40 divisors (see below), whose sum is σ = 1992144. Its totient is φ = 622080.

The previous prime is 1123541. The next prime is 1123553. The reversal of 1123551 is 1553211.

1123551 is a `hidden beast` number, since 112 + 3 + 551 = 666.

It is not a de Polignac number, because 1123551 - 2⁶ = 1123487 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11535 + ... + 11631.

2^1123551 is an apocalyptic number.

1123551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1123551 is a deficient number, since it is larger than the sum of its proper divisors (868593).

1123551 is a wasteful number, since it uses less digits than its factorization.

1123551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 124 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 1123551 is about 1059.9768865405. The cubic root of 1123551 is about 103.9595195020.

Adding to 1123551 its reverse (1553211), we get a palindrome (2676762).

It can be divided in two parts, 11235 and 51, that multiplied together give a triangular number (572985 = T₁₀₇₀).

The spelling of 1123551 in words is "one million, one hundred twenty-three thousand, five hundred fifty-one".