11331781 has 2 divisors, whose sum is σ = 11331782. Its totient is φ = 11331780.

The previous prime is 11331769. The next prime is 11331797. The reversal of 11331781 is 18713311.

11331781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 216225 = 3334^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 11331781 - 2⁹ = 11331269 is a prime.

It is a super-2 number, since 2×11331781² = 256818521263922, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11331701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5665890 + 5665891.

It is an arithmetic number, because the mean of its divisors is an integer number (5665891).

Almost surely, 2^11331781 is an apocalyptic number.

It is an amenable number.

11331781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11331781 is an equidigital number, since it uses as much as digits as its factorization.

11331781 is an evil number, because the sum of its binary digits is even.

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

The square root of 11331781 is about 3366.2710823699. The cubic root of 11331781 is about 224.6118806832.

The spelling of 11331781 in words is "eleven million, three hundred thirty-one thousand, seven hundred eighty-one".