109660391 has 2 divisors, whose sum is σ = 109660392. Its totient is φ = 109660390.

The previous prime is 109660379. The next prime is 109660393. The reversal of 109660391 is 193066901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109660391 - 2²² = 105466087 is a prime.

Together with 109660393, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_6284951 and since 109660391 and 6284951 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109660393) 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, 54830195 + 54830196.

It is an arithmetic number, because the mean of its divisors is an integer number (54830196).

Almost surely, 2^109660391 is an apocalyptic number.

109660391 is a deficient number, since it is larger than the sum of its proper divisors (1).

109660391 is an equidigital number, since it uses as much as digits as its factorization.

109660391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 109660391 is about 10471.8857423102. The cubic root of 109660391 is about 478.6483836532.

The spelling of 109660391 in words is "one hundred nine million, six hundred sixty thousand, three hundred ninety-one".