109191161 has 2 divisors, whose sum is σ = 109191162. Its totient is φ = 109191160.

The previous prime is 109191151. The next prime is 109191169. The reversal of 109191161 is 161191901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 48038761 = 7820^2 + 6931^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 191161601 and 106161191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109191161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109191169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54595580 + 54595581.

It is an arithmetic number, because the mean of its divisors is an integer number (54595581).

Almost surely, 2^109191161 is an apocalyptic number.

It is an amenable number.

109191161 is a deficient number, since it is larger than the sum of its proper divisors (1).

109191161 is an equidigital number, since it uses as much as digits as its factorization.

109191161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 29.

The square root of 109191161 is about 10449.4574500306. The cubic root of 109191161 is about 477.9647053531.

The spelling of 109191161 in words is "one hundred nine million, one hundred ninety-one thousand, one hundred sixty-one".