1109781311 has 2 divisors, whose sum is σ = 1109781312. Its totient is φ = 1109781310.

The previous prime is 1109781287. The next prime is 1109781313. The reversal of 1109781311 is 1131879011.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1131879011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109781311 - 2⁶ = 1109781247 is a prime.

It is a super-2 number, since 2×1109781311² = 2463229116489757442, which contains 22 as substring.

Together with 1109781313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109781313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554890655 + 554890656.

It is an arithmetic number, because the mean of its divisors is an integer number (554890656).

Almost surely, 2^1109781311 is an apocalyptic number.

1109781311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109781311 is an equidigital number, since it uses as much as digits as its factorization.

1109781311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 32.

The square root of 1109781311 is about 33313.3803598494. The cubic root of 1109781311 is about 1035.3308038865.

The spelling of 1109781311 in words is "one billion, one hundred nine million, seven hundred eighty-one thousand, three hundred eleven".