109781611 has 2 divisors, whose sum is σ = 109781612. Its totient is φ = 109781610.

The previous prime is 109781591. The next prime is 109781653. The reversal of 109781611 is 116187901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109781611 - 2⁵ = 109781579 is a prime.

It is a super-2 number, since 2×109781611² = 24104004227510642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109781311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54890805 + 54890806.

It is an arithmetic number, because the mean of its divisors is an integer number (54890806).

Almost surely, 2^109781611 is an apocalyptic number.

109781611 is a deficient number, since it is larger than the sum of its proper divisors (1).

109781611 is an equidigital number, since it uses as much as digits as its factorization.

109781611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 34.

The square root of 109781611 is about 10477.6720219713. The cubic root of 109781611 is about 478.8246867235.

The spelling of 109781611 in words is "one hundred nine million, seven hundred eighty-one thousand, six hundred eleven".