105709991 has 2 divisors, whose sum is σ = 105709992. Its totient is φ = 105709990.

The previous prime is 105709963. The next prime is 105709997. The reversal of 105709991 is 199907501.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (199907501) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105709991 is a prime.

It is a super-2 number, since 2×105709991² = 22349204394440162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105709997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52854995 + 52854996.

It is an arithmetic number, because the mean of its divisors is an integer number (52854996).

Almost surely, 2^105709991 is an apocalyptic number.

105709991 is a deficient number, since it is larger than the sum of its proper divisors (1).

105709991 is an equidigital number, since it uses as much as digits as its factorization.

105709991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 105709991 is about 10281.5364124240. The cubic root of 105709991 is about 472.8303500582.

The spelling of 105709991 in words is "one hundred five million, seven hundred nine thousand, nine hundred ninety-one".