105820691 has 2 divisors, whose sum is σ = 105820692. Its totient is φ = 105820690.

The previous prime is 105820679. The next prime is 105820783. The reversal of 105820691 is 196028501.

It is a weak prime.

It is an emirp because it is prime and its reverse (196028501) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105820691 is a prime.

It is a super-2 number, since 2×105820691² = 22396037287434962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (105820651) 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, 52910345 + 52910346.

It is an arithmetic number, because the mean of its divisors is an integer number (52910346).

Almost surely, 2^105820691 is an apocalyptic number.

105820691 is a deficient number, since it is larger than the sum of its proper divisors (1).

105820691 is an equidigital number, since it uses as much as digits as its factorization.

105820691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 105820691 is about 10286.9184404271. The cubic root of 105820691 is about 472.9953425338.

The spelling of 105820691 in words is "one hundred five million, eight hundred twenty thousand, six hundred ninety-one".