109821161 has 2 divisors, whose sum is σ = 109821162. Its totient is φ = 109821160.

The previous prime is 109821149. The next prime is 109821181. The reversal of 109821161 is 161128901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89965225 + 19855936 = 9485^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 109821161 - 2¹⁴ = 109804777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109821181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54910580 + 54910581.

It is an arithmetic number, because the mean of its divisors is an integer number (54910581).

Almost surely, 2^109821161 is an apocalyptic number.

It is an amenable number.

109821161 is a deficient number, since it is larger than the sum of its proper divisors (1).

109821161 is an equidigital number, since it uses as much as digits as its factorization.

109821161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 109821161 is about 10479.5591987450. The cubic root of 109821161 is about 478.8821803920.

The spelling of 109821161 in words is "one hundred nine million, eight hundred twenty-one thousand, one hundred sixty-one".