11781133 has 16 divisors (see below), whose sum is σ = 14896000. Its totient is φ = 9066816.

The previous prime is 11781089. The next prime is 11781139. The reversal of 11781133 is 33118711.

It is a cyclic number.

It is not a de Polignac number, because 11781133 - 2¹⁷ = 11650061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11781098 and 11781107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781139) 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 15 ways as a sum of consecutive naturals, for example, 1618 + ... + 5116.

It is an arithmetic number, because the mean of its divisors is an integer number (931000).

Almost surely, 2^11781133 is an apocalyptic number.

11781133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11781133 is a deficient number, since it is larger than the sum of its proper divisors (3114867).

11781133 is a wasteful number, since it uses less digits than its factorization.

11781133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556.

The product of its digits is 504, while the sum is 25.

The square root of 11781133 is about 3432.3655108394. The cubic root of 11781133 is about 227.5424096761.

Adding to 11781133 its reverse (33118711), we get a palindrome (44899844).

It can be divided in two parts, 117 and 81133, that multiplied together give a square (9492561 = 3081²).

The spelling of 11781133 in words is "eleven million, seven hundred eighty-one thousand, one hundred thirty-three".