1109761021 has 2 divisors, whose sum is σ = 1109761022. Its totient is φ = 1109761020.

The previous prime is 1109761007. The next prime is 1109761049. The reversal of 1109761021 is 1201679011.

It is an a-pointer prime, because the next prime (1109761049) can be obtained adding 1109761021 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768065796 + 341695225 = 27714^2 + 18485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109761021 - 2¹⁵ = 1109728253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109761721) 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, 554880510 + 554880511.

It is an arithmetic number, because the mean of its divisors is an integer number (554880511).

Almost surely, 2^1109761021 is an apocalyptic number.

It is an amenable number.

1109761021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109761021 is an equidigital number, since it uses as much as digits as its factorization.

1109761021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 1109761021 is about 33313.0758261677. The cubic root of 1109761021 is about 1035.3244942380.

The spelling of 1109761021 in words is "one billion, one hundred nine million, seven hundred sixty-one thousand, twenty-one".